| Value | Category | Cases | |
|---|---|---|---|
| 1967 | 7 |
0%
|
|
| 1968 | 237 |
1.6%
|
|
| 1969 | 238 |
1.6%
|
|
| 1970 | 285 |
2%
|
|
| 1971 | 234 |
1.6%
|
|
| 1972 | 392 |
2.7%
|
|
| 1973 | 248 |
1.7%
|
|
| 1974 | 336 |
2.3%
|
|
| 1975 | 320 |
2.2%
|
|
| 1976 | 267 |
1.8%
|
|
| 1977 | 404 |
2.8%
|
|
| 1978 | 320 |
2.2%
|
|
| 1979 | 368 |
2.5%
|
|
| 1980 | 347 |
2.4%
|
|
| 1981 | 294 |
2%
|
|
| 1982 | 416 |
2.8%
|
|
| 1983 | 350 |
2.4%
|
|
| 1984 | 316 |
2.2%
|
|
| 1985 | 393 |
2.7%
|
|
| 1986 | 323 |
2.2%
|
|
| 1987 | 375 |
2.6%
|
|
| 1988 | 341 |
2.3%
|
|
| 1989 | 360 |
2.5%
|
|
| 1990 | 438 |
3%
|
|
| 1991 | 390 |
2.7%
|
|
| 1992 | 570 |
3.9%
|
|
| 1993 | 514 |
3.5%
|
|
| 1994 | 579 |
4%
|
|
| 1995 | 628 |
4.3%
|
|
| 1996 | 521 |
3.6%
|
|
| 1997 | 622 |
4.3%
|
|
| 1998 | 540 |
3.7%
|
|
| 1999 | 584 |
4%
|
|
| 2000 | 616 |
4.2%
|
|
| 2001 | 529 |
3.6%
|
|
| 2002 | 668 |
4.6%
|
|
| 2003 | 3 |
0%
|
|
| 9998 | DK | 1 |
0%
|
| Sysmiss | 235 |
1.6%
|