| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
0.1%
|
|
| 1995 | 3 |
0.4%
|
|
| 1996 | 1 |
0.1%
|
|
| 1997 | 5 |
0.6%
|
|
| 1998 | 7 |
0.9%
|
|
| 1999 | 7 |
0.9%
|
|
| 2000 | 12 |
1.5%
|
|
| 2001 | 9 |
1.1%
|
|
| 2002 | 7 |
0.9%
|
|
| 2003 | 16 |
2%
|
|
| 2004 | 16 |
2%
|
|
| 2005 | 13 |
1.6%
|
|
| 2006 | 20 |
2.5%
|
|
| 2007 | 21 |
2.6%
|
|
| 2008 | 26 |
3.2%
|
|
| 2009 | 21 |
2.6%
|
|
| 2010 | 41 |
5.1%
|
|
| 2011 | 31 |
3.8%
|
|
| 2012 | 51 |
6.3%
|
|
| 2013 | 46 |
5.7%
|
|
| 2014 | 49 |
6.1%
|
|
| 2015 | 56 |
6.9%
|
|
| 2016 | 57 |
7.1%
|
|
| 2017 | 79 |
9.8%
|
|
| 2018 | 65 |
8.1%
|
|
| 2019 | 70 |
8.7%
|
|
| 2020 | 50 |
6.2%
|
|
| 2021 | 4 |
0.5%
|
|
| Dont Know | 21 |
2.6%
|
|
| Refuse to answer | 1 |
0.1%
|