| Value | Category | Cases | |
|---|---|---|---|
| 1975 | 4 |
1%
|
|
| 1976 | 1 |
0.2%
|
|
| 1978 | 2 |
0.5%
|
|
| 1979 | 2 |
0.5%
|
|
| 1980 | 4 |
1%
|
|
| 1981 | 3 |
0.7%
|
|
| 1982 | 2 |
0.5%
|
|
| 1983 | 6 |
1.4%
|
|
| 1984 | 10 |
2.4%
|
|
| 1985 | 6 |
1.4%
|
|
| 1986 | 7 |
1.7%
|
|
| 1987 | 12 |
2.9%
|
|
| 1988 | 9 |
2.2%
|
|
| 1989 | 14 |
3.4%
|
|
| 1990 | 15 |
3.6%
|
|
| 1991 | 16 |
3.8%
|
|
| 1992 | 16 |
3.8%
|
|
| 1993 | 16 |
3.8%
|
|
| 1994 | 23 |
5.5%
|
|
| 1995 | 17 |
4.1%
|
|
| 1996 | 19 |
4.6%
|
|
| 1997 | 25 |
6%
|
|
| 1998 | 37 |
8.9%
|
|
| 1999 | 29 |
7%
|
|
| 2000 | 44 |
10.6%
|
|
| 2001 | 31 |
7.4%
|
|
| 2002 | 46 |
11%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | Don't know | 1 |
0.2%
|
| Sysmiss | 8027 |