| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
0.1%
|
|
| 2000 | 175 |
15.5%
|
|
| 2001 | 486 |
43.2%
|
|
| 2002 | 461 |
40.9%
|
|
| 2003 | 1 |
0.1%
|
|
| 2004 | 1 |
0.1%
|
|
| 2005 | 1 |
0.1%
|
|
| Sysmiss | 42 |