| Value | Category | Cases | |
|---|---|---|---|
| -9 | don't know | 12 |
4.7%
|
| -8 | does not apply | 0 |
0%
|
| -7 | refused to answer | 0 |
0%
|
| 1982 | 1 |
0.4%
|
|
| 1984 | 1 |
0.4%
|
|
| 1990 | 2 |
0.8%
|
|
| 1998 | 1 |
0.4%
|
|
| 1999 | 2 |
0.8%
|
|
| 2000 | 5 |
2%
|
|
| 2002 | 2 |
0.8%
|
|
| 2003 | 2 |
0.8%
|
|
| 2004 | 5 |
2%
|
|
| 2005 | 8 |
3.1%
|
|
| 2006 | 19 |
7.5%
|
|
| 2007 | 57 |
22.4%
|
|
| 2008 | 137 |
53.9%
|
|
| Sysmiss | 502 |