| Value | Category | Cases | |
|---|---|---|---|
| 1998 | 1 |
2.1%
|
|
| 2001 | 1 |
2.1%
|
|
| 2003 | 3 |
6.3%
|
|
| 2004 | 3 |
6.3%
|
|
| 2005 | 14 |
29.2%
|
|
| 2006 | 25 |
52.1%
|
|
| 9998 | 1 |
2.1%
|
|
| Sysmiss | 1335 |