| Value | Category | Cases | |
|---|---|---|---|
| 1984 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1985 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1986 | 3 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 1987 | 6 | 
                                                                 
                                    
                                    2%
                                 
                                                             | 
                                                        
                    |
| 1988 | 8 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    |
| 1989 | 10 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 1990 | 19 | 
                                                                 
                                    
                                    6.5%
                                 
                                                             | 
                                                        
                    |
| 1991 | 13 | 
                                                                 
                                    
                                    4.4%
                                 
                                                             | 
                                                        
                    |
| 1992 | 18 | 
                                                                 
                                    
                                    6.1%
                                 
                                                             | 
                                                        
                    |
| 1993 | 23 | 
                                                                 
                                    
                                    7.8%
                                 
                                                             | 
                                                        
                    |
| 1994 | 34 | 
                                                                 
                                    
                                    11.6%
                                 
                                                             | 
                                                        
                    |
| 1995 | 23 | 
                                                                 
                                    
                                    7.8%
                                 
                                                             | 
                                                        
                    |
| 1996 | 27 | 
                                                                 
                                    
                                    9.2%
                                 
                                                             | 
                                                        
                    |
| 1997 | 27 | 
                                                                 
                                    
                                    9.2%
                                 
                                                             | 
                                                        
                    |
| 1998 | 30 | 
                                                                 
                                    
                                    10.2%
                                 
                                                             | 
                                                        
                    |
| 1999 | 39 | 
                                                                 
                                    
                                    13.3%
                                 
                                                             | 
                                                        
                    |
| 2000 | 10 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 9997 | inconsistent | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9998 | dk | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 15058 |