| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 2007 | 2 |
0.1%
|
| 2008 | 2008 | 5 |
0.3%
|
| 2009 | 2009 | 5 |
0.3%
|
| 2010 | 2010 | 32 |
1.7%
|
| 2011 | 2011 | 407 |
21.3%
|
| 2012 | 2012 | 1457 |
76.4%
|
| Sysmiss | 28420 |