| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 5 |
0.8%
|
|
| 2009 | 92 |
15.3%
|
|
| 2010 | 504 |
83.6%
|
|
| 2011 | 2 |
0.3%
|
|
| Sysmiss | 41595 |