| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 2 |
1.4%
|
|
| 2002 | 27 |
18.2%
|
|
| 2003 | 53 |
35.8%
|
|
| 2004 | 48 |
32.4%
|
|
| 2005 | 18 |
12.2%
|
|
| Sysmiss | 6622 |