| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 2007 | 6 |
0.4%
|
| 2008 | 2008 | 15 |
1%
|
| 2009 | 2009 | 36 |
2.4%
|
| 2010 | 2010 | 207 |
13.8%
|
| 2011 | 2011 | 652 |
43.4%
|
| 2012 | 2012 | 585 |
39%
|
| Sysmiss | 8399 |