| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 1 |
2.4%
|
|
| 2004 | 2 |
4.8%
|
|
| 2005 | 10 |
23.8%
|
|
| 2006 | 14 |
33.3%
|
|
| 2007 | 15 |
35.7%
|
|
| Sysmiss | 847 |