| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 1 |
0.8%
|
|
| 2003 | 2 |
1.5%
|
|
| 2004 | 23 |
17.4%
|
|
| 2005 | 53 |
40.2%
|
|
| 2006 | 37 |
28%
|
|
| 9998 | 16 |
12.1%
|
|
| Sysmiss | 133 |