| Value | Category | Cases | |
|---|---|---|---|
| 1984 | 2 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1985 | 6 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 1986 | 3 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1987 | 3 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1988 | 2 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1989 | 5 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 1990 | 9 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    |
| 1991 | 4 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 1992 | 12 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 1993 | 6 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 1994 | 15 | 
                                                                 
                                    
                                    2%
                                 
                                                             | 
                                                        
                    |
| 1995 | 14 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 1996 | 17 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    |
| 1997 | 27 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 1998 | 46 | 
                                                                 
                                    
                                    6%
                                 
                                                             | 
                                                        
                    |
| 1999 | 56 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    |
| 2000 | 50 | 
                                                                 
                                    
                                    6.6%
                                 
                                                             | 
                                                        
                    |
| 2001 | 73 | 
                                                                 
                                    
                                    9.6%
                                 
                                                             | 
                                                        
                    |
| 2002 | 74 | 
                                                                 
                                    
                                    9.7%
                                 
                                                             | 
                                                        
                    |
| 2003 | 124 | 
                                                                 
                                    
                                    16.3%
                                 
                                                             | 
                                                        
                    |
| 2004 | 213 | 
                                                                 
                                    
                                    28%
                                 
                                                             | 
                                                        
                    |
| 9997 | inconsistent | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9998 | don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 10001 | .Z | 7471 |