| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 4 |
1.1%
|
|
| 2004 | 4 |
1.1%
|
|
| 2005 | 2 |
0.6%
|
|
| 2006 | 4 |
1.1%
|
|
| 2007 | 8 |
2.2%
|
|
| 2008 | 5 |
1.4%
|
|
| 2009 | 14 |
3.9%
|
|
| 2010 | 16 |
4.5%
|
|
| 2011 | 12 |
3.4%
|
|
| 2012 | 17 |
4.8%
|
|
| 2013 | 19 |
5.3%
|
|
| 2014 | 26 |
7.3%
|
|
| 2015 | 34 |
9.6%
|
|
| 2016 | 34 |
9.6%
|
|
| 2017 | 47 |
13.2%
|
|
| 2018 | 34 |
9.6%
|
|
| 2019 | 44 |
12.4%
|
|
| 2020 | 13 |
3.7%
|
|
| 2021 | 1 |
0.3%
|
|
| Dont Know | 18 |
5.1%
|