| Value | Category | Cases | |
|---|---|---|---|
| 1968 | 3 |
0.1%
|
|
| 1969 | 58 |
2%
|
|
| 1970 | 63 |
2.2%
|
|
| 1971 | 53 |
1.8%
|
|
| 1972 | 51 |
1.7%
|
|
| 1973 | 62 |
2.1%
|
|
| 1974 | 55 |
1.9%
|
|
| 1975 | 59 |
2%
|
|
| 1976 | 73 |
2.5%
|
|
| 1977 | 55 |
1.9%
|
|
| 1978 | 74 |
2.5%
|
|
| 1979 | 72 |
2.5%
|
|
| 1980 | 88 |
3%
|
|
| 1981 | 85 |
2.9%
|
|
| 1982 | 82 |
2.8%
|
|
| 1983 | 81 |
2.8%
|
|
| 1984 | 79 |
2.7%
|
|
| 1985 | 88 |
3%
|
|
| 1986 | 83 |
2.8%
|
|
| 1987 | 89 |
3%
|
|
| 1988 | 85 |
2.9%
|
|
| 1989 | 73 |
2.5%
|
|
| 1990 | 77 |
2.6%
|
|
| 1991 | 73 |
2.5%
|
|
| 1992 | 44 |
1.5%
|
|
| 1993 | 72 |
2.5%
|
|
| 1994 | 58 |
2%
|
|
| 1995 | 51 |
1.7%
|
|
| 1996 | 43 |
1.5%
|
|
| 1997 | 40 |
1.4%
|
|
| 1998 | 47 |
1.6%
|
|
| 1999 | 41 |
1.4%
|
|
| 2000 | 58 |
2%
|
|
| 2001 | 70 |
2.4%
|
|
| 2002 | 45 |
1.5%
|
|
| 2003 | 44 |
1.5%
|
|
| 9998 | DK | 2 |
0.1%
|
| Sysmiss | 652 |
22.3%
|