| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
16.7%
|
|
| 2003 | 1 |
16.7%
|
|
| 2007 | 1 |
16.7%
|
|
| 2008 | 3 |
50%
|
|
| Sysmiss | 4373 |