| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 2 |
8%
|
|
| 2003 | 1 |
4%
|
|
| 2004 | 3 |
12%
|
|
| 2005 | 2 |
8%
|
|
| 2006 | 10 |
40%
|
|
| 2007 | 7 |
28%
|
|
| 9999 | 2 | ||
| Sysmiss | 4176 |