| Value | Category | Cases | |
|---|---|---|---|
| 1967 | 1 |
0.3%
|
|
| 1971 | 1 |
0.3%
|
|
| 1973 | 1 |
0.3%
|
|
| 1974 | 2 |
0.6%
|
|
| 1975 | 5 |
1.5%
|
|
| 1976 | 3 |
0.9%
|
|
| 1977 | 2 |
0.6%
|
|
| 1979 | 2 |
0.6%
|
|
| 1980 | 8 |
2.4%
|
|
| 1981 | 3 |
0.9%
|
|
| 1982 | 4 |
1.2%
|
|
| 1983 | 4 |
1.2%
|
|
| 1984 | 5 |
1.5%
|
|
| 1985 | 6 |
1.8%
|
|
| 1986 | 7 |
2.1%
|
|
| 1987 | 9 |
2.7%
|
|
| 1988 | 7 |
2.1%
|
|
| 1989 | 6 |
1.8%
|
|
| 1990 | 10 |
3%
|
|
| 1991 | 7 |
2.1%
|
|
| 1992 | 7 |
2.1%
|
|
| 1993 | 24 |
7.3%
|
|
| 1994 | 12 |
3.6%
|
|
| 1995 | 16 |
4.8%
|
|
| 1996 | 18 |
5.5%
|
|
| 1997 | 19 |
5.8%
|
|
| 1998 | 44 |
13.3%
|
|
| 1999 | 69 |
20.9%
|
|
| 2000 | 28 |
8.5%
|
|
| 9993 | inconsistent | 0 |
0%
|
| 9998 | don't know | 0 |
0%
|
| 9999 | not applicable | 0 |
0%
|
| 9999995 | missing:impute | 0 |
0%
|
| Sysmiss | 2926 |
