| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 2 |
0.3%
|
|
| 1988 | 1 |
0.2%
|
|
| 1992 | 1 |
0.2%
|
|
| 1993 | 8 |
1.3%
|
|
| 1994 | 1 |
0.2%
|
|
| 1997 | 57 |
9.5%
|
|
| 1998 | 8 |
1.3%
|
|
| 1999 | 12 |
2%
|
|
| 2000 | 21 |
3.5%
|
|
| 2001 | 13 |
2.2%
|
|
| 2002 | 5 |
0.8%
|
|
| 2003 | 6 |
1%
|
|
| 2004 | 2 |
0.3%
|
|
| 2005 | 4 |
0.7%
|
|
| 2006 | 8 |
1.3%
|
|
| 2007 | 9 |
1.5%
|
|
| 2008 | 13 |
2.2%
|
|
| 2009 | 95 |
15.8%
|
|
| 2010 | 12 |
2%
|
|
| 2011 | 3 |
0.5%
|
|
| 2012 | 2 |
0.3%
|
|
| 2013 | 131 |
21.8%
|
|
| 2014 | 75 |
12.5%
|
|
| 2015 | 52 |
8.6%
|
|
| 2016 | 20 |
3.3%
|
|
| 2017 | 10 |
1.7%
|
|
| 2018 | 9 |
1.5%
|
|
| 2019 | 3 |
0.5%
|
|
| Missing value | 19 |
3.2%
|