| Value | Category | Cases | |
|---|---|---|---|
| 1968 | 107 | 
                                    
                                    1.3%
                                 | |
| 1969 | 161 | 
                                    
                                    2%
                                 | |
| 1970 | 150 | 
                                    
                                    1.8%
                                 | |
| 1971 | 147 | 
                                    
                                    1.8%
                                 | |
| 1972 | 126 | 
                                    
                                    1.5%
                                 | |
| 1973 | 134 | 
                                    
                                    1.6%
                                 | |
| 1974 | 167 | 
                                    
                                    2%
                                 | |
| 1975 | 173 | 
                                    
                                    2.1%
                                 | |
| 1976 | 169 | 
                                    
                                    2.1%
                                 | |
| 1977 | 168 | 
                                    
                                    2%
                                 | |
| 1978 | 170 | 
                                    
                                    2.1%
                                 | |
| 1979 | 195 | 
                                    
                                    2.4%
                                 | |
| 1980 | 221 | 
                                    
                                    2.7%
                                 | |
| 1981 | 234 | 
                                    
                                    2.8%
                                 | |
| 1982 | 226 | 
                                    
                                    2.8%
                                 | |
| 1983 | 252 | 
                                    
                                    3.1%
                                 | |
| 1984 | 256 | 
                                    
                                    3.1%
                                 | |
| 1985 | 261 | 
                                    
                                    3.2%
                                 | |
| 1986 | 267 | 
                                    
                                    3.2%
                                 | |
| 1987 | 260 | 
                                    
                                    3.2%
                                 | |
| 1988 | 245 | 
                                    
                                    3%
                                 | |
| 1989 | 285 | 
                                    
                                    3.5%
                                 | |
| 1990 | 266 | 
                                    
                                    3.2%
                                 | |
| 1991 | 271 | 
                                    
                                    3.3%
                                 | |
| 1992 | 269 | 
                                    
                                    3.3%
                                 | |
| 1993 | 263 | 
                                    
                                    3.2%
                                 | |
| 1994 | 265 | 
                                    
                                    3.2%
                                 | |
| 1995 | 256 | 
                                    
                                    3.1%
                                 | |
| 1996 | 245 | 
                                    
                                    3%
                                 | |
| 1997 | 215 | 
                                    
                                    2.6%
                                 | |
| 1998 | 210 | 
                                    
                                    2.6%
                                 | |
| 1999 | 193 | 
                                    
                                    2.3%
                                 | |
| 2000 | 237 | 
                                    
                                    2.9%
                                 | |
| 2001 | 188 | 
                                    
                                    2.3%
                                 | |
| 2002 | 187 | 
                                    
                                    2.3%
                                 | |
| 2003 | 51 | 
                                    
                                    0.6%
                                 | |
| 9998 | NO SABE | 12 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 715 | 
                                    
                                    8.7%
                                 |