| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 1 |
0.3%
|
|
| 1996 | 1 |
0.3%
|
|
| 1998 | 2 |
0.6%
|
|
| 2000 | 2 |
0.6%
|
|
| 2004 | 1 |
0.3%
|
|
| 2005 | 1 |
0.3%
|
|
| 2006 | 4 |
1.2%
|
|
| 2008 | 2 |
0.6%
|
|
| 2009 | 1 |
0.3%
|
|
| 2011 | 23 |
6.8%
|
|
| 2012 | 5 |
1.5%
|
|
| 2014 | 5 |
1.5%
|
|
| 2015 | 44 |
13.1%
|
|
| 2016 | 51 |
15.1%
|
|
| 2017 | 194 |
57.6%
|
|
| Sysmiss | 716 |