| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 1 |
1.3%
|
|
| 2007 | 1 |
1.3%
|
|
| 2008 | 1 |
1.3%
|
|
| 2009 | 50 |
63.3%
|
|
| 9999 | Yet to back | 26 |
32.9%
|
| Sysmiss | 6206 |