| Value | Category | Cases | |
|---|---|---|---|
| 1987 | 1 |
11.1%
|
|
| 2000 | 2 |
22.2%
|
|
| 2001 | 1 |
11.1%
|
|
| 2004 | 3 |
33.3%
|
|
| 2006 | 1 |
11.1%
|
|
| 2007 | 1 |
11.1%
|
|
| Sysmiss | 12906 |