| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
2.8%
|
|
| 1996 | 1 |
2.8%
|
|
| 2000 | 1 |
2.8%
|
|
| 2001 | 1 |
2.8%
|
|
| 2003 | 2 |
5.6%
|
|
| 2004 | 4 |
11.1%
|
|
| 2005 | 5 |
13.9%
|
|
| 2006 | 2 |
5.6%
|
|
| 2007 | 11 |
30.6%
|
|
| 2008 | 7 |
19.4%
|
|
| 9998 | dk | 1 |
2.8%
|
| Sysmiss | 51272 |