| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
0.3%
|
|
| 2000 | 2 |
0.6%
|
|
| 2001 | 2 |
0.6%
|
|
| 2002 | 1 |
0.3%
|
|
| 2003 | 6 |
1.8%
|
|
| 2005 | 5 |
1.5%
|
|
| 2006 | 2 |
0.6%
|
|
| 2007 | 18 |
5.3%
|
|
| 2008 | 15 |
4.4%
|
|
| 2009 | 20 |
5.9%
|
|
| 2010 | 32 |
9.4%
|
|
| 2011 | 32 |
9.4%
|
|
| 2012 | 25 |
7.4%
|
|
| 2013 | 34 |
10%
|
|
| 2014 | 12 |
3.5%
|
|
| 2015 | 12 |
3.5%
|
|
| 2016 | 32 |
9.4%
|
|
| 2017 | 26 |
7.7%
|
|
| 2018 | 32 |
9.4%
|
|
| 2019 | 22 |
6.5%
|
|
| 2020 | 8 |
2.4%
|