| Value | Category | Cases | |
|---|---|---|---|
| -9 | don't know | 7 |
1%
|
| -8 | does not apply | 0 |
0%
|
| -7 | refused to answer | 0 |
0%
|
| 1980 | 2 |
0.3%
|
|
| 1982 | 1 |
0.1%
|
|
| 1984 | 1 |
0.1%
|
|
| 1987 | 1 |
0.1%
|
|
| 1990 | 4 |
0.6%
|
|
| 1993 | 3 |
0.4%
|
|
| 1994 | 2 |
0.3%
|
|
| 1995 | 5 |
0.7%
|
|
| 1996 | 4 |
0.6%
|
|
| 1998 | 9 |
1.2%
|
|
| 1999 | 15 |
2.1%
|
|
| 2000 | 18 |
2.5%
|
|
| 2001 | 8 |
1.1%
|
|
| 2002 | 13 |
1.8%
|
|
| 2003 | 31 |
4.3%
|
|
| 2004 | 36 |
5%
|
|
| 2005 | 68 |
9.4%
|
|
| 2006 | 183 |
25.3%
|
|
| 2007 | 212 |
29.4%
|
|
| 2008 | 99 |
13.7%
|
|
| Sysmiss | 34 |