| Value | Category | Cases | |
|---|---|---|---|
| 1986 | 1 |
0.1%
|
|
| 1991 | 1 |
0.1%
|
|
| 1992 | 5 |
0.3%
|
|
| 1994 | 1 |
0.1%
|
|
| 1996 | 2 |
0.1%
|
|
| 1997 | 3 |
0.2%
|
|
| 1999 | 2 |
0.1%
|
|
| 2000 | 7 |
0.4%
|
|
| 2001 | 7 |
0.4%
|
|
| 2002 | 2 |
0.1%
|
|
| 2003 | 15 |
1%
|
|
| 2004 | 8 |
0.5%
|
|
| 2005 | 11 |
0.7%
|
|
| 2006 | 9 |
0.6%
|
|
| 2007 | 9 |
0.6%
|
|
| 2008 | 9 |
0.6%
|
|
| 2009 | 13 |
0.8%
|
|
| 2010 | 5 |
0.3%
|
|
| 2011 | 4 |
0.3%
|
|
| 2012 | 19 |
1.2%
|
|
| 2013 | 169 |
10.8%
|
|
| 2014 | 477 |
30.4%
|
|
| 2015 | 180 |
11.5%
|
|
| 2016 | 79 |
5%
|
|
| 2017 | 119 |
7.6%
|
|
| 2018 | 40 |
2.5%
|
|
| Missing value | 374 |
23.8%
|