| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 1 |
0%
|
|
| 2004 | 4 |
0.1%
|
|
| 2005 | 1 |
0%
|
|
| 2006 | 3 |
0.1%
|
|
| 2007 | 3443 |
99.7%
|
|
| Sysmiss | 224 |