| Value | Category | Cases | |
|---|---|---|---|
| 1998 | 1 |
0.2%
|
|
| 2000 | 4 |
0.9%
|
|
| 2002 | 22 |
4.9%
|
|
| 2003 | 68 |
15.1%
|
|
| 2004 | 90 |
20%
|
|
| 2005 | 264 |
58.7%
|
|
| 2006 | 1 |
0.2%
|
|
| Sysmiss | 2500 |