| Value | Category | Cases | |
|---|---|---|---|
| 3 | 2003 | 1 |
0.2%
|
| 4 | 2004 | 88 |
13.9%
|
| 5 | 2005 | 149 |
23.6%
|
| 6 | 2006 | 150 |
23.8%
|
| 7 | 2007 | 99 |
15.7%
|
| 8 | 2008 | 123 |
19.5%
|
| 9 | 2009 | 21 |
3.3%
|
| Sysmiss | 4 |