| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 5 |
0.1%
|
|
| 2006 | 60 |
1.8%
|
|
| 2007 | 593 |
17.8%
|
|
| 2008 | 758 |
22.7%
|
|
| 2009 | 893 |
26.7%
|
|
| 2010 | 790 |
23.7%
|
|
| 2011 | 241 |
7.2%
|
|
| Sysmiss | 26163 |