| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 8 |
15.1%
|
|
| 2004 | 5 |
9.4%
|
|
| 2005 | 17 |
32.1%
|
|
| 2006 | 22 |
41.5%
|
|
| 2007 | 1 |
1.9%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 917 |