| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 1 |
0.3%
|
|
| 2009 | 47 |
14.4%
|
|
| 2010 | 277 |
84.7%
|
|
| 2011 | 2 |
0.6%
|
|
| Sysmiss | 20720 |