| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 5 |
0.6%
|
|
| 2002 | 41 |
4.5%
|
|
| 2003 | 98 |
10.8%
|
|
| 2004 | 110 |
12.1%
|
|
| 2005 | 235 |
25.9%
|
|
| 2006 | 283 |
31.2%
|
|
| 2007 | 136 |
15%
|
|
| Sysmiss | 24092 |