| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 1 |
0.6%
|
|
| 2002 | 2 |
1.3%
|
|
| 2003 | 4 |
2.6%
|
|
| 2004 | 50 |
32.5%
|
|
| 2005 | 66 |
42.9%
|
|
| 2006 | 29 |
18.8%
|
|
| 9998 | 2 |
1.3%
|
|
| Sysmiss | 111 |