| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 6 |
0.7%
|
|
| 2005 | 46 |
5.4%
|
|
| 2006 | 106 |
12.3%
|
|
| 2007 | 105 |
12.2%
|
|
| 2008 | 195 |
22.7%
|
|
| 2009 | 282 |
32.8%
|
|
| 2010 | 119 |
13.9%
|
|
| Sysmiss | 2 |