| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 1 |
0.4%
|
|
| 2003 | 21 |
8.3%
|
|
| 2004 | 75 |
29.6%
|
|
| 2005 | 100 |
39.5%
|
|
| 2006 | 56 |
22.1%
|
|
| Sysmiss | 6058 |