| Value | Category | Cases | |
|---|---|---|---|
| 1974 | 1 |
0.2%
|
|
| 1975 | 1 |
0.2%
|
|
| 1980 | 1 |
0.2%
|
|
| 1987 | 1 |
0.2%
|
|
| 1989 | 1 |
0.2%
|
|
| 1992 | 3 |
0.5%
|
|
| 1996 | 1 |
0.2%
|
|
| 1997 | 2 |
0.3%
|
|
| 1998 | 2 |
0.3%
|
|
| 1999 | 3 |
0.5%
|
|
| 2000 | 23 |
3.5%
|
|
| 2001 | 6 |
0.9%
|
|
| 2002 | 16 |
2.5%
|
|
| 2003 | 10 |
1.5%
|
|
| 2004 | 8 |
1.2%
|
|
| 2005 | 10 |
1.5%
|
|
| 2006 | 11 |
1.7%
|
|
| 2007 | 13 |
2%
|
|
| 2008 | 22 |
3.4%
|
|
| 2009 | 16 |
2.5%
|
|
| 2010 | 16 |
2.5%
|
|
| 2011 | 15 |
2.3%
|
|
| 2012 | 29 |
4.4%
|
|
| 2013 | 44 |
6.7%
|
|
| 2014 | 75 |
11.5%
|
|
| 2015 | 89 |
13.6%
|
|
| 2016 | 102 |
15.6%
|
|
| 2017 | 107 |
16.4%
|
|
| 2018 | 25 |
3.8%
|
|
| Sysmiss | 1985 |