| Value | Category | Cases | |
|---|---|---|---|
| 1968 | 1 |
0%
|
|
| 1969 | 45 |
2.1%
|
|
| 1970 | 41 |
1.9%
|
|
| 1971 | 28 |
1.3%
|
|
| 1972 | 39 |
1.8%
|
|
| 1973 | 30 |
1.4%
|
|
| 1974 | 38 |
1.8%
|
|
| 1975 | 47 |
2.2%
|
|
| 1976 | 36 |
1.7%
|
|
| 1977 | 42 |
2%
|
|
| 1978 | 32 |
1.5%
|
|
| 1979 | 65 |
3%
|
|
| 1980 | 57 |
2.6%
|
|
| 1981 | 39 |
1.8%
|
|
| 1982 | 56 |
2.6%
|
|
| 1983 | 41 |
1.9%
|
|
| 1984 | 63 |
2.9%
|
|
| 1985 | 54 |
2.5%
|
|
| 1986 | 62 |
2.9%
|
|
| 1987 | 87 |
4%
|
|
| 1988 | 54 |
2.5%
|
|
| 1989 | 63 |
2.9%
|
|
| 1990 | 77 |
3.6%
|
|
| 1991 | 71 |
3.3%
|
|
| 1992 | 82 |
3.8%
|
|
| 1993 | 61 |
2.8%
|
|
| 1994 | 64 |
3%
|
|
| 1995 | 74 |
3.4%
|
|
| 1996 | 88 |
4.1%
|
|
| 1997 | 74 |
3.4%
|
|
| 1998 | 82 |
3.8%
|
|
| 1999 | 82 |
3.8%
|
|
| 2000 | 90 |
4.2%
|
|
| 2001 | 77 |
3.6%
|
|
| 2002 | 73 |
3.4%
|
|
| 2003 | 67 |
3.1%
|
|
| 9998 | DK | 1 |
0%
|
| Sysmiss | 70 |
3.3%
|