| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 6 |
0.7%
|
|
| 2002 | 34 |
4%
|
|
| 2003 | 103 |
12.1%
|
|
| 2004 | 110 |
12.9%
|
|
| 2005 | 200 |
23.5%
|
|
| 2006 | 255 |
30%
|
|
| 2007 | 142 |
16.7%
|
|
| Sysmiss | 24150 |