| Value | Category | Cases | |
|---|---|---|---|
| -2 | don't know | 3 |
8.1%
|
| -1 | refuse | 0 |
0%
|
| 2000 | 2 |
5.4%
|
|
| 2001 | 1 |
2.7%
|
|
| 2002 | 3 |
8.1%
|
|
| 2003 | 5 |
13.5%
|
|
| 2004 | 3 |
8.1%
|
|
| 2005 | 2 |
5.4%
|
|
| 2006 | 5 |
13.5%
|
|
| 2007 | 7 |
18.9%
|
|
| 2008 | 5 |
13.5%
|
|
| 2009 | 1 |
2.7%
|
|
| Sysmiss | 1012 |