| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2011 | 188 |
52.2%
|
| 2 | 2010 | 89 |
24.7%
|
| 3 | 2008-2009 | 46 |
12.8%
|
| 4 | 2005-2007 | 14 |
3.9%
|
| 5 | 2004 and below | 19 |
5.3%
|
| 9 | Not specified | 4 |
1.1%
|
| Sysmiss | 3652 |