| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 2007 | 1 |
0.1%
|
| 2008 | 2008 | 0 |
0%
|
| 2009 | 2009 | 1 |
0.1%
|
| 2010 | 2010 | 10 |
1.3%
|
| 2011 | 2011 | 22 |
2.8%
|
| 2012 | 2012 | 738 |
95.6%
|
| Sysmiss | 1012 |