| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
5.3%
|
|
| 2000 | 2 |
10.5%
|
|
| 2001 | 1 |
5.3%
|
|
| 2002 | 2 |
10.5%
|
|
| 2003 | 3 |
15.8%
|
|
| 2004 | 5 |
26.3%
|
|
| 2005 | 2 |
10.5%
|
|
| 8888 | 8888. refused | 0 |
0%
|
| 9999 | 9999. don't know | 3 |
15.8%
|
| Sysmiss | 80 |