| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 3 |
9.1%
|
|
| 2003 | 5 |
15.2%
|
|
| 2004 | 7 |
21.2%
|
|
| 2005 | 11 |
33.3%
|
|
| 2006 | 7 |
21.2%
|
|
| Sysmiss | 889 |