| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 1 |
5.3%
|
|
| 2009 | 6 |
31.6%
|
|
| 2010 | 7 |
36.8%
|
|
| 2011 | 5 |
26.3%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 741 |