| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 11 |
4.4%
|
|
| 2003 | 35 |
14.1%
|
|
| 2004 | 40 |
16.1%
|
|
| 2005 | 55 |
22.1%
|
|
| 2006 | 108 |
43.4%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 721 |