| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 1 |
0.7%
|
|
| 2002 | 2 |
1.3%
|
|
| 2003 | 4 |
2.7%
|
|
| 2004 | 47 |
31.3%
|
|
| 2005 | 54 |
36%
|
|
| 2006 | 36 |
24%
|
|
| 9998 | 6 |
4%
|
|
| Sysmiss | 115 |