| Value | Category | Cases | |
|---|---|---|---|
| 1965 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 1966 | 7 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1967 | 19 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 1968 | 27 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1969 | 55 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 1970 | 101 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 1971 | 138 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 1972 | 188 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 1973 | 189 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 1974 | 161 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 1975 | 148 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    |
| 1976 | 114 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 1977 | 129 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    |
| 1978 | 191 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 1979 | 388 | 
                                                                 
                                    
                                    3.9%
                                 
                                                             | 
                                                        
                    |
| 1980 | 611 | 
                                                                 
                                    
                                    6.2%
                                 
                                                             | 
                                                        
                    |
| 1981 | 448 | 
                                                                 
                                    
                                    4.5%
                                 
                                                             | 
                                                        
                    |
| 1982 | 407 | 
                                                                 
                                    
                                    4.1%
                                 
                                                             | 
                                                        
                    |
| 1983 | 334 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 1984 | 329 | 
                                                                 
                                    
                                    3.3%
                                 
                                                             | 
                                                        
                    |
| 1985 | 335 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 1986 | 351 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 1987 | 374 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    |
| 1988 | 404 | 
                                                                 
                                    
                                    4.1%
                                 
                                                             | 
                                                        
                    |
| 1989 | 434 | 
                                                                 
                                    
                                    4.4%
                                 
                                                             | 
                                                        
                    |
| 1990 | 504 | 
                                                                 
                                    
                                    5.1%
                                 
                                                             | 
                                                        
                    |
| 1991 | 424 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    |
| 1992 | 440 | 
                                                                 
                                    
                                    4.4%
                                 
                                                             | 
                                                        
                    |
| 1993 | 496 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    |
| 1994 | 482 | 
                                                                 
                                    
                                    4.9%
                                 
                                                             | 
                                                        
                    |
| 1995 | 300 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 1996 | 343 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 1997 | 319 | 
                                                                 
                                    
                                    3.2%
                                 
                                                             | 
                                                        
                    |
| 1998 | 275 | 
                                                                 
                                    
                                    2.8%
                                 
                                                             | 
                                                        
                    |
| 1999 | 337 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 2000 | 124 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    |
| 9997 | inconsistent | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9998 | dk | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 5423 |