| 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 |