| Value | Category | Cases | |
|---|---|---|---|
| 1998 | 2 |
8%
|
|
| 2007 | 1 |
4%
|
|
| 2009 | 1 |
4%
|
|
| 2011 | 9 |
36%
|
|
| 2014 | 2 |
8%
|
|
| 2015 | 5 |
20%
|
|
| 2017 | 4 |
16%
|
|
| 2018 | 1 |
4%
|
|
| Sysmiss | 257 |