| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 1 |
3.3%
|
|
| 2003 | 2 |
6.7%
|
|
| 2004 | 4 |
13.3%
|
|
| 2005 | 3 |
10%
|
|
| 2006 | 12 |
40%
|
|
| 2007 | 7 |
23.3%
|
|
| 2008 | 1 |
3.3%
|
|
| 9999 | 5 | ||
| Sysmiss | 4168 |