| Value | Category | Cases | |
|---|---|---|---|
| 1993 | 6 |
1.5%
|
|
| 1994 | 2 |
0.5%
|
|
| 1997 | 3 |
0.8%
|
|
| 2003 | 2 |
0.5%
|
|
| 2004 | 1 |
0.3%
|
|
| 2005 | 4 |
1%
|
|
| 2006 | 2 |
0.5%
|
|
| 2007 | 4 |
1%
|
|
| 2009 | 1 |
0.3%
|
|
| 2010 | 2 |
0.5%
|
|
| 2011 | 243 |
62%
|
|
| 2012 | 46 |
11.7%
|
|
| 2013 | 17 |
4.3%
|
|
| 2014 | 16 |
4.1%
|
|
| 2015 | 27 |
6.9%
|
|
| 2016 | 9 |
2.3%
|
|
| 2017 | 5 |
1.3%
|
|
| Missing value | 2 |
0.5%
|