| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 1 |
20%
|
|
| 1998 | 1 |
20%
|
|
| 2003 | 1 |
20%
|
|
| 2011 | 1 |
20%
|
|
| 2017 | 1 |
20%
|
|
| Sysmiss | 210 |