| Value | Category | Cases | |
|---|---|---|---|
| 1963 | 1 |
0%
|
|
| 1964 | 3 |
0%
|
|
| 1965 | 9 |
0.1%
|
|
| 1966 | 20 |
0.2%
|
|
| 1967 | 35 |
0.3%
|
|
| 1968 | 66 |
0.6%
|
|
| 1969 | 93 |
0.9%
|
|
| 1970 | 210 |
2%
|
|
| 1971 | 146 |
1.4%
|
|
| 1972 | 170 |
1.6%
|
|
| 1973 | 127 |
1.2%
|
|
| 1974 | 114 |
1.1%
|
|
| 1975 | 142 |
1.3%
|
|
| 1976 | 158 |
1.5%
|
|
| 1977 | 207 |
1.9%
|
|
| 1978 | 292 |
2.7%
|
|
| 1979 | 691 |
6.4%
|
|
| 1980 | 411 |
3.8%
|
|
| 1981 | 236 |
2.2%
|
|
| 1982 | 274 |
2.5%
|
|
| 1983 | 307 |
2.9%
|
|
| 1984 | 269 |
2.5%
|
|
| 1985 | 306 |
2.8%
|
|
| 1986 | 300 |
2.8%
|
|
| 1987 | 408 |
3.8%
|
|
| 1988 | 333 |
3.1%
|
|
| 1989 | 376 |
3.5%
|
|
| 1990 | 405 |
3.8%
|
|
| 1991 | 307 |
2.9%
|
|
| 1992 | 363 |
3.4%
|
|
| 1993 | 396 |
3.7%
|
|
| 1994 | 256 |
2.4%
|
|
| 1995 | 268 |
2.5%
|
|
| 1996 | 266 |
2.5%
|
|
| 1997 | 263 |
2.4%
|
|
| 1998 | 289 |
2.7%
|
|
| 1999 | 286 |
2.7%
|
|
| 2000 | 217 |
2%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk year | 1729 |
16.1%
|
| Sysmiss | 5236 |