| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 3 |
1.5%
|
|
| 2002 | 32 |
15.5%
|
|
| 2003 | 35 |
17%
|
|
| 2004 | 31 |
15%
|
|
| 2005 | 31 |
15%
|
|
| 2006 | 41 |
19.9%
|
|
| 2007 | 33 |
16%
|
|
| Sysmiss | 1160 |