| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
5.6%
|
|
| 2001 | 3 |
16.7%
|
|
| 2002 | 10 |
55.6%
|
|
| 2003 | 4 |
22.2%
|
|
| Sysmiss | 4553 |