| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 6 |
4%
|
|
| 2006 | 5 |
3.3%
|
|
| 2007 | 34 |
22.7%
|
|
| 2008 | 72 |
48%
|
|
| 2009 | 33 |
22%
|
|
| Sysmiss | 300 |