| Value | Category | Cases | |
|---|---|---|---|
| -2 | Refusal to answer | 1 |
0.9%
|
| -1 | Don't know | 5 |
4.4%
|
| 0 | 5 |
4.4%
|
|
| 1953 | 1 |
0.9%
|
|
| 1954 | 1 |
0.9%
|
|
| 1959 | 1 |
0.9%
|
|
| 1965 | 1 |
0.9%
|
|
| 1966 | 1 |
0.9%
|
|
| 1970 | 2 |
1.8%
|
|
| 1974 | 2 |
1.8%
|
|
| 1985 | 2 |
1.8%
|
|
| 1989 | 4 |
3.5%
|
|
| 1990 | 6 |
5.3%
|
|
| 1991 | 2 |
1.8%
|
|
| 1992 | 7 |
6.2%
|
|
| 1993 | 7 |
6.2%
|
|
| 1994 | 11 |
9.7%
|
|
| 1995 | 9 |
8%
|
|
| 1996 | 21 |
18.6%
|
|
| 1997 | 6 |
5.3%
|
|
| 1998 | 7 |
6.2%
|
|
| 1999 | 3 |
2.7%
|
|
| 2000 | 7 |
6.2%
|
|
| 2001 | 1 |
0.9%
|
|
| Sysmiss | 2520 |