| Value | Category | Cases | |
|---|---|---|---|
| -9 | don't know | 11 |
2.1%
|
| -8 | does not apply | 0 |
0%
|
| -7 | refused to answer | 0 |
0%
|
| 1994 | 1 |
0.2%
|
|
| 1995 | 1 |
0.2%
|
|
| 1996 | 1 |
0.2%
|
|
| 1998 | 3 |
0.6%
|
|
| 1999 | 6 |
1.1%
|
|
| 2000 | 3 |
0.6%
|
|
| 2001 | 10 |
1.9%
|
|
| 2002 | 10 |
1.9%
|
|
| 2003 | 28 |
5.2%
|
|
| 2004 | 39 |
7.3%
|
|
| 2005 | 142 |
26.5%
|
|
| 2006 | 180 |
33.6%
|
|
| 2007 | 80 |
14.9%
|
|
| 2008 | 21 |
3.9%
|
|
| Sysmiss | 220 |