| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 1 |
0.6%
|
|
| 2004 | 6 |
3.5%
|
|
| 2005 | 11 |
6.4%
|
|
| 2006 | 12 |
7%
|
|
| 2007 | 19 |
11.1%
|
|
| 2008 | 47 |
27.5%
|
|
| 2009 | 64 |
37.4%
|
|
| 2010 | 8 |
4.7%
|
|
| 2011 | 3 |
1.8%
|
|
| Sysmiss | 22 |