| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
1.1%
|
|
| 2002 | 13 |
14.1%
|
|
| 2003 | 14 |
15.2%
|
|
| 2004 | 10 |
10.9%
|
|
| 2005 | 22 |
23.9%
|
|
| 2006 | 10 |
10.9%
|
|
| 2007 | 22 |
23.9%
|
|
| Sysmiss | 114 |