| Value | Category | Cases | |
|---|---|---|---|
| 1988 | 1 |
0.9%
|
|
| 1996 | 1 |
0.9%
|
|
| 2000 | 3 |
2.6%
|
|
| 2002 | 1 |
0.9%
|
|
| 2003 | 1 |
0.9%
|
|
| 2004 | 1 |
0.9%
|
|
| 2005 | 1 |
0.9%
|
|
| 2007 | 2 |
1.8%
|
|
| 2008 | 1 |
0.9%
|
|
| 2009 | 1 |
0.9%
|
|
| 2010 | 7 |
6.1%
|
|
| 2011 | 10 |
8.8%
|
|
| 2012 | 19 |
16.7%
|
|
| 2013 | 28 |
24.6%
|
|
| 2014 | 29 |
25.4%
|
|
| 2015 | 8 |
7%
|
|
| Sysmiss | 86 |