| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
0.4%
|
|
| 2005 | 2 |
0.9%
|
|
| 2006 | 5 |
2.2%
|
|
| 2007 | 8 |
3.6%
|
|
| 2008 | 29 |
12.9%
|
|
| 2009 | 178 |
79.1%
|
|
| 2010 | 2 |
0.9%
|
|
| Sysmiss | 225 |