| Value | Category | Cases | |
|---|---|---|---|
| 1998 | 2 |
9.1%
|
|
| 2006 | 1 |
4.5%
|
|
| 2014 | 2 |
9.1%
|
|
| 2015 | 4 |
18.2%
|
|
| 2016 | 3 |
13.6%
|
|
| 2017 | 4 |
18.2%
|
|
| 2018 | 3 |
13.6%
|
|
| 2019 | 3 |
13.6%
|
|
| Sysmiss | 2205 |