| Value | Category | Cases | |
|---|---|---|---|
| 1965 | 1 |
2%
|
|
| 1970 | 1 |
2%
|
|
| 1971 | 1 |
2%
|
|
| 1974 | 1 |
2%
|
|
| 1976 | 1 |
2%
|
|
| 1980 | 3 |
5.9%
|
|
| 1981 | 3 |
5.9%
|
|
| 1984 | 1 |
2%
|
|
| 1986 | 3 |
5.9%
|
|
| 1987 | 1 |
2%
|
|
| 1989 | 1 |
2%
|
|
| 1990 | 1 |
2%
|
|
| 1991 | 2 |
3.9%
|
|
| 1993 | 3 |
5.9%
|
|
| 1995 | 2 |
3.9%
|
|
| 1996 | 3 |
5.9%
|
|
| 1997 | 2 |
3.9%
|
|
| 1998 | 3 |
5.9%
|
|
| 2000 | 2 |
3.9%
|
|
| 2002 | 2 |
3.9%
|
|
| 2005 | 2 |
3.9%
|
|
| 9998 | 9998. Refused | 4 |
7.8%
|
| 9999 | 9999. Don't Know | 8 |
15.7%
|
| Sysmiss | 948 |