| Value | Category | Cases | |
|---|---|---|---|
| 1969 | 35 |
2.3%
|
|
| 1970 | 20 |
1.3%
|
|
| 1971 | 36 |
2.4%
|
|
| 1972 | 35 |
2.3%
|
|
| 1973 | 39 |
2.6%
|
|
| 1974 | 39 |
2.6%
|
|
| 1975 | 34 |
2.3%
|
|
| 1976 | 41 |
2.7%
|
|
| 1977 | 36 |
2.4%
|
|
| 1978 | 32 |
2.1%
|
|
| 1979 | 43 |
2.9%
|
|
| 1980 | 41 |
2.7%
|
|
| 1981 | 41 |
2.7%
|
|
| 1982 | 31 |
2.1%
|
|
| 1983 | 28 |
1.9%
|
|
| 1984 | 29 |
1.9%
|
|
| 1985 | 41 |
2.7%
|
|
| 1986 | 36 |
2.4%
|
|
| 1987 | 40 |
2.7%
|
|
| 1988 | 48 |
3.2%
|
|
| 1989 | 55 |
3.7%
|
|
| 1990 | 37 |
2.5%
|
|
| 1991 | 44 |
2.9%
|
|
| 1992 | 41 |
2.7%
|
|
| 1993 | 45 |
3%
|
|
| 1994 | 45 |
3%
|
|
| 1995 | 39 |
2.6%
|
|
| 1996 | 52 |
3.5%
|
|
| 1997 | 45 |
3%
|
|
| 1998 | 57 |
3.8%
|
|
| 1999 | 43 |
2.9%
|
|
| 2000 | 46 |
3.1%
|
|
| 2001 | 52 |
3.5%
|
|
| 2002 | 40 |
2.7%
|
|
| 2003 | 49 |
3.3%
|
|
| 2004 | 4 |
0.3%
|
|
| 9998 | DK | 2 |
0.1%
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 78 |
5.2%
|