| Value | Category | Cases | |
|---|---|---|---|
| 1988 | 1 |
1.3%
|
|
| 2000 | 1 |
1.3%
|
|
| 2008 | 1 |
1.3%
|
|
| 2009 | 1 |
1.3%
|
|
| 2010 | 1 |
1.3%
|
|
| 2012 | 2 |
2.6%
|
|
| 2013 | 6 |
7.9%
|
|
| 2014 | 9 |
11.8%
|
|
| 2015 | 15 |
19.7%
|
|
| 2016 | 25 |
32.9%
|
|
| 2017 | 14 |
18.4%
|
|
| Sysmiss | 4127 |