| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 1 |
0.4%
|
|
| 2005 | 1 |
0.4%
|
|
| 2006 | 2 |
0.7%
|
|
| 2007 | 3 |
1.1%
|
|
| 2008 | 20 |
7.3%
|
|
| 2009 | 107 |
39.2%
|
|
| 2010 | 139 |
50.9%
|
|
| Sysmiss | 37 |