| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 2006 | 1 |
0.1%
|
| 2007 | 2007 | 0 |
0%
|
| 2008 | 2008 | 2 |
0.1%
|
| 2009 | 2009 | 256 |
18.9%
|
| 2010 | 2010 | 725 |
53.5%
|
| 2011 | 2011 | 372 |
27.4%
|
| Sysmiss | 6046 |