| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 62 |
6.9%
|
|
| 2008 | 114 |
12.7%
|
|
| 2009 | 432 |
48.1%
|
|
| 2010 | 290 |
32.3%
|
|
| Sysmiss | 29088 |