| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
0.1%
|
|
| 1991 | 9 |
0.6%
|
|
| 1992 | 36 |
2.5%
|
|
| 1993 | 6 |
0.4%
|
|
| 1994 | 8 |
0.6%
|
|
| 1995 | 2 |
0.1%
|
|
| 1996 | 2 |
0.1%
|
|
| 1997 | 6 |
0.4%
|
|
| 1998 | 9 |
0.6%
|
|
| 1999 | 6 |
0.4%
|
|
| 2000 | 32 |
2.3%
|
|
| 2001 | 12 |
0.8%
|
|
| 2002 | 14 |
1%
|
|
| 2003 | 11 |
0.8%
|
|
| 2004 | 35 |
2.5%
|
|
| 2005 | 21 |
1.5%
|
|
| 2006 | 32 |
2.3%
|
|
| 2007 | 26 |
1.8%
|
|
| 2008 | 38 |
2.7%
|
|
| 2009 | 35 |
2.5%
|
|
| 2010 | 104 |
7.3%
|
|
| 2011 | 41 |
2.9%
|
|
| 2012 | 62 |
4.4%
|
|
| 2013 | 92 |
6.5%
|
|
| 2014 | 90 |
6.3%
|
|
| 2015 | 72 |
5.1%
|
|
| 2016 | 285 |
20.1%
|
|
| 2017 | 201 |
14.2%
|
|
| 2018 | 20 |
1.4%
|
|
| Missing value | 112 |
7.9%
|