| Value | Category | Cases | |
|---|---|---|---|
| 1 | Before 2007 | 86 |
4.9%
|
| 2 | 2008 | 71 |
4.1%
|
| 3 | 2009 | 161 |
9.2%
|
| 4 | 2010 | 901 |
51.4%
|
| 5 | 2011 | 500 |
28.5%
|
| 6 | 2012 | 9 |
0.5%
|
| 7 | Not specified | 24 |
1.4%
|
| Sysmiss | 1111 |