| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 1 |
0.5%
|
|
| 2007 | 1 |
0.5%
|
|
| 2008 | 28 |
14.6%
|
|
| 2009 | 38 |
19.8%
|
|
| 2010 | 50 |
26%
|
|
| 2011 | 74 |
38.5%
|
|
| Sysmiss | 1140 |