| Value | Category | Cases | |
|---|---|---|---|
| 1969 | 1 |
0%
|
|
| 1970 | 4 |
0.2%
|
|
| 1971 | 6 |
0.3%
|
|
| 1972 | 5 |
0.2%
|
|
| 1973 | 8 |
0.4%
|
|
| 1974 | 8 |
0.4%
|
|
| 1975 | 9 |
0.4%
|
|
| 1976 | 5 |
0.2%
|
|
| 1977 | 9 |
0.4%
|
|
| 1978 | 20 |
1%
|
|
| 1979 | 30 |
1.4%
|
|
| 1980 | 19 |
0.9%
|
|
| 1981 | 16 |
0.8%
|
|
| 1982 | 28 |
1.3%
|
|
| 1983 | 34 |
1.6%
|
|
| 1984 | 31 |
1.5%
|
|
| 1985 | 44 |
2.1%
|
|
| 1986 | 58 |
2.8%
|
|
| 1987 | 48 |
2.3%
|
|
| 1988 | 60 |
2.9%
|
|
| 1989 | 54 |
2.6%
|
|
| 1990 | 93 |
4.5%
|
|
| 1991 | 73 |
3.5%
|
|
| 1992 | 104 |
5%
|
|
| 1993 | 127 |
6.1%
|
|
| 1994 | 124 |
5.9%
|
|
| 1995 | 137 |
6.6%
|
|
| 1996 | 133 |
6.4%
|
|
| 1997 | 180 |
8.6%
|
|
| 1998 | 204 |
9.8%
|
|
| 1999 | 292 |
14%
|
|
| 2000 | 121 |
5.8%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 13900 |