| Value | Category | Cases | |
|---|---|---|---|
| 1970 | 1 |
0%
|
|
| 1971 | 4 |
0.1%
|
|
| 1972 | 6 |
0.1%
|
|
| 1973 | 7 |
0.1%
|
|
| 1974 | 15 |
0.3%
|
|
| 1975 | 22 |
0.4%
|
|
| 1976 | 33 |
0.6%
|
|
| 1977 | 27 |
0.5%
|
|
| 1978 | 58 |
1.1%
|
|
| 1979 | 112 |
2.1%
|
|
| 1980 | 114 |
2.2%
|
|
| 1981 | 138 |
2.6%
|
|
| 1982 | 137 |
2.6%
|
|
| 1983 | 142 |
2.7%
|
|
| 1984 | 214 |
4.1%
|
|
| 1985 | 260 |
4.9%
|
|
| 1986 | 275 |
5.2%
|
|
| 1987 | 325 |
6.2%
|
|
| 1988 | 310 |
5.9%
|
|
| 1989 | 334 |
6.3%
|
|
| 1990 | 306 |
5.8%
|
|
| 1991 | 278 |
5.3%
|
|
| 1992 | 253 |
4.8%
|
|
| 1993 | 310 |
5.9%
|
|
| 1994 | 344 |
6.5%
|
|
| 1995 | 218 |
4.1%
|
|
| 1996 | 242 |
4.6%
|
|
| 1997 | 221 |
4.2%
|
|
| 1998 | 217 |
4.1%
|
|
| 1999 | 250 |
4.7%
|
|
| 2000 | 96 |
1.8%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 2 |
0%
|
| Sysmiss | 10714 |