| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 1 |
1%
|
|
| 2003 | 1 |
1%
|
|
| 2004 | 1 |
1%
|
|
| 2005 | 8 |
8.2%
|
|
| 2006 | 21 |
21.4%
|
|
| 2007 | 25 |
25.5%
|
|
| 2008 | 41 |
41.8%
|
|
| Sysmiss | 662 |