| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 1 |
0.1%
|
|
| 2005 | 9 |
0.6%
|
|
| 2006 | 1401 |
99.2%
|
|
| 2007 | 1 |
0.1%
|
|
| Sysmiss | 2367 |