| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
2%
|
|
| 2000 | 4 |
8.2%
|
|
| 2001 | 5 |
10.2%
|
|
| 2002 | 5 |
10.2%
|
|
| 2003 | 11 |
22.4%
|
|
| 2004 | 10 |
20.4%
|
|
| 2005 | 12 |
24.5%
|
|
| 2006 | 1 |
2%
|
|
| Sysmiss | 8085 |