| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 1 |
0.2%
|
|
| 2007 | 1 |
0.2%
|
|
| 2008 | 8 |
1.2%
|
|
| 2009 | 403 |
60.6%
|
|
| 2010 | 252 |
37.9%
|
|
| Sysmiss | 901 |