| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 2 |
4.4%
|
|
| 2002 | 16 |
35.6%
|
|
| 2003 | 17 |
37.8%
|
|
| 2004 | 10 |
22.2%
|
|
| Sysmiss | 10632 |