| Value | Category | Cases | |
|---|---|---|---|
| 0 | 4 |
12.5%
|
|
| 2006 | 1 |
3.1%
|
|
| 2008 | 3 |
9.4%
|
|
| 2009 | 3 |
9.4%
|
|
| 2010 | 1 |
3.1%
|
|
| 2011 | 5 |
15.6%
|
|
| 2012 | 4 |
12.5%
|
|
| 2013 | 11 |
34.4%
|
|
| Sysmiss | 868 |