| Value | Category | Cases | |
|---|---|---|---|
| 1968 | 15 |
0.3%
|
|
| 1969 | 26 |
0.6%
|
|
| 1970 | 54 |
1.2%
|
|
| 1971 | 43 |
1%
|
|
| 1972 | 39 |
0.9%
|
|
| 1973 | 42 |
0.9%
|
|
| 1974 | 48 |
1.1%
|
|
| 1975 | 66 |
1.5%
|
|
| 1976 | 52 |
1.2%
|
|
| 1977 | 59 |
1.3%
|
|
| 1978 | 48 |
1.1%
|
|
| 1979 | 61 |
1.4%
|
|
| 1980 | 83 |
1.8%
|
|
| 1981 | 55 |
1.2%
|
|
| 1982 | 81 |
1.8%
|
|
| 1983 | 85 |
1.9%
|
|
| 1984 | 81 |
1.8%
|
|
| 1985 | 75 |
1.7%
|
|
| 1986 | 92 |
2%
|
|
| 1987 | 73 |
1.6%
|
|
| 1988 | 81 |
1.8%
|
|
| 1989 | 76 |
1.7%
|
|
| 1990 | 85 |
1.9%
|
|
| 1991 | 87 |
1.9%
|
|
| 1992 | 99 |
2.2%
|
|
| 1993 | 80 |
1.8%
|
|
| 1994 | 97 |
2.2%
|
|
| 1995 | 96 |
2.1%
|
|
| 1996 | 107 |
2.4%
|
|
| 1997 | 91 |
2%
|
|
| 1998 | 120 |
2.7%
|
|
| 1999 | 135 |
3%
|
|
| 2000 | 157 |
3.5%
|
|
| 2001 | 149 |
3.3%
|
|
| 2002 | 153 |
3.4%
|
|
| 2003 | 80 |
1.8%
|
|
| 9998 | DK YEAR | 2 |
0%
|
| Sysmiss | 1632 |
36.2%
|