| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 1 |
2.4%
|
|
| 2003 | 4 |
9.8%
|
|
| 2004 | 10 |
24.4%
|
|
| 2005 | 21 |
51.2%
|
|
| 2006 | 5 |
12.2%
|
|
| Sysmiss | 6270 |