| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 3 |
6.4%
|
|
| 2005 | 3 |
6.4%
|
|
| 2006 | 6 |
12.8%
|
|
| 2007 | 1 |
2.1%
|
|
| 2008 | 11 |
23.4%
|
|
| 2009 | 1 |
2.1%
|
|
| 2010 | 5 |
10.6%
|
|
| 2011 | 4 |
8.5%
|
|
| 2012 | 4 |
8.5%
|
|
| 2013 | 9 |
19.1%
|
|
| Sysmiss | 420 |