| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 1 |
1.3%
|
|
| 2007 | 1 |
1.3%
|
|
| 2008 | 4 |
5.1%
|
|
| 2009 | 73 |
92.4%
|
|
| Sysmiss | 6206 |