| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 4 |
2.5%
|
|
| 2005 | 3 |
1.8%
|
|
| 2006 | 50 |
30.7%
|
|
| 2007 | 27 |
16.6%
|
|
| 2008 | 28 |
17.2%
|
|
| 2009 | 42 |
25.8%
|
|
| 2010 | 6 |
3.7%
|
|
| 2011 | 2 |
1.2%
|
|
| 2012 | 1 |
0.6%
|
|
| Sysmiss | 300 |