| Value | Category | Cases | |
|---|---|---|---|
| 1985 | 2 |
4.3%
|
|
| 1989 | 1 |
2.2%
|
|
| 1990 | 1 |
2.2%
|
|
| 1991 | 1 |
2.2%
|
|
| 1994 | 2 |
4.3%
|
|
| 1997 | 1 |
2.2%
|
|
| 2000 | 2 |
4.3%
|
|
| 2001 | 1 |
2.2%
|
|
| 2006 | 1 |
2.2%
|
|
| 2007 | 1 |
2.2%
|
|
| 2009 | 2 |
4.3%
|
|
| 2010 | 5 |
10.9%
|
|
| 2012 | 4 |
8.7%
|
|
| 2013 | 4 |
8.7%
|
|
| 2014 | 3 |
6.5%
|
|
| 2015 | 6 |
13%
|
|
| 2016 | 3 |
6.5%
|
|
| 2017 | 6 |
13%
|
|
| Sysmiss | 2181 |