| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 2 |
0.5%
|
|
| 2005 | 26 |
6%
|
|
| 2006 | 61 |
14.1%
|
|
| 2007 | 53 |
12.3%
|
|
| 2008 | 94 |
21.8%
|
|
| 2009 | 129 |
29.9%
|
|
| 2010 | 67 |
15.5%
|
|
| Sysmiss | 2 |