| Value | Category | Cases | |
|---|---|---|---|
| 1992 | 1 |
0.5%
|
|
| 1994 | 1 |
0.5%
|
|
| 1996 | 4 |
2%
|
|
| 1999 | 2 |
1%
|
|
| 2000 | 2 |
1%
|
|
| 2001 | 4 |
2%
|
|
| 2002 | 2 |
1%
|
|
| 2003 | 1 |
0.5%
|
|
| 2004 | 2 |
1%
|
|
| 2005 | 1 |
0.5%
|
|
| 2006 | 3 |
1.5%
|
|
| 2007 | 5 |
2.5%
|
|
| 2008 | 7 |
3.5%
|
|
| 2009 | 13 |
6.4%
|
|
| 2010 | 8 |
4%
|
|
| 2011 | 26 |
12.9%
|
|
| 2012 | 8 |
4%
|
|
| 2013 | 10 |
5%
|
|
| 2014 | 13 |
6.4%
|
|
| 2015 | 23 |
11.4%
|
|
| 2016 | 19 |
9.4%
|
|
| 2017 | 23 |
11.4%
|
|
| 2018 | 24 |
11.9%
|