| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 4 |
0.5%
|
|
| 2002 | 25 |
3.4%
|
|
| 2003 | 89 |
12.1%
|
|
| 2004 | 98 |
13.3%
|
|
| 2005 | 174 |
23.6%
|
|
| 2006 | 226 |
30.7%
|
|
| 2007 | 121 |
16.4%
|
|
| Sysmiss | 24263 |