| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 4 |
2.8%
|
|
| 2003 | 2 |
1.4%
|
|
| 2005 | 3 |
2.1%
|
|
| 2006 | 5 |
3.5%
|
|
| 2007 | 20 |
13.9%
|
|
| 2008 | 21 |
14.6%
|
|
| 2009 | 52 |
36.1%
|
|
| 2010 | 30 |
20.8%
|
|
| 2011 | 7 |
4.9%
|
|
| Sysmiss | 182 |