| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
0%
|
|
| 2000 | 84 |
2.3%
|
|
| 2001 | 190 |
5.2%
|
|
| 2002 | 391 |
10.7%
|
|
| 2003 | 725 |
19.9%
|
|
| 2004 | 1112 |
30.5%
|
|
| 2005 | 1086 |
29.8%
|
|
| 2006 | 55 |
1.5%
|
|
| Sysmiss | 32974 |