| Value | Category | Cases | |
|---|---|---|---|
| -9 | don't know | 4 |
1.5%
|
| -8 | does not apply | 0 |
0%
|
| -7 | refused to answer | 0 |
0%
|
| 1995 | 2 |
0.8%
|
|
| 1996 | 1 |
0.4%
|
|
| 1997 | 1 |
0.4%
|
|
| 2000 | 4 |
1.5%
|
|
| 2001 | 1 |
0.4%
|
|
| 2002 | 1 |
0.4%
|
|
| 2003 | 2 |
0.8%
|
|
| 2004 | 3 |
1.1%
|
|
| 2005 | 6 |
2.3%
|
|
| 2006 | 13 |
5%
|
|
| 2007 | 63 |
24.1%
|
|
| 2008 | 160 |
61.3%
|
|
| Sysmiss | 495 |