| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 27 |
4.9%
|
|
| 2008 | 101 |
18.3%
|
|
| 2009 | 95 |
17.2%
|
|
| 2010 | 115 |
20.8%
|
|
| 2011 | 120 |
21.7%
|
|
| 2012 | 93 |
16.8%
|
|
| 9999 | Missing | 1 |
0.2%
|
| Sysmiss | 2578 |