| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
0.8%
|
|
| 2002 | 17 |
14.2%
|
|
| 2003 | 23 |
19.2%
|
|
| 2004 | 15 |
12.5%
|
|
| 2005 | 20 |
16.7%
|
|
| 2006 | 20 |
16.7%
|
|
| 2007 | 24 |
20%
|
|
| Sysmiss | 86 |