| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
1.4%
|
|
| 1998 | 1 |
1.4%
|
|
| 2000 | 2 |
2.8%
|
|
| 2003 | 1 |
1.4%
|
|
| 2004 | 1 |
1.4%
|
|
| 2005 | 1 |
1.4%
|
|
| 2007 | 1 |
1.4%
|
|
| 2008 | 4 |
5.6%
|
|
| 2009 | 2 |
2.8%
|
|
| 2010 | 4 |
5.6%
|
|
| 2011 | 14 |
19.4%
|
|
| 2012 | 13 |
18.1%
|
|
| 2013 | 17 |
23.6%
|
|
| 2014 | 8 |
11.1%
|
|
| 2015 | 2 |
2.8%
|