| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 5 |
11.6%
|
|
| 2009 | 9 |
20.9%
|
|
| 2010 | 10 |
23.3%
|
|
| 2011 | 19 |
44.2%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 585 |