| Value | Category | Cases | |
|---|---|---|---|
| 1977 | 1 |
0.5%
|
|
| 1985 | 1 |
0.5%
|
|
| 1986 | 1 |
0.5%
|
|
| 1990 | 2 |
1%
|
|
| 1994 | 1 |
0.5%
|
|
| 1995 | 1 |
0.5%
|
|
| 1997 | 1 |
0.5%
|
|
| 1998 | 3 |
1.5%
|
|
| 2000 | 2 |
1%
|
|
| 2001 | 4 |
2.1%
|
|
| 2002 | 2 |
1%
|
|
| 2005 | 4 |
2.1%
|
|
| 2006 | 2 |
1%
|
|
| 2007 | 1 |
0.5%
|
|
| 2008 | 4 |
2.1%
|
|
| 2009 | 3 |
1.5%
|
|
| 2010 | 5 |
2.6%
|
|
| 2011 | 6 |
3.1%
|
|
| 2012 | 8 |
4.1%
|
|
| 2013 | 6 |
3.1%
|
|
| 2014 | 5 |
2.6%
|
|
| 2015 | 9 |
4.6%
|
|
| 2016 | 14 |
7.2%
|
|
| 2017 | 16 |
8.2%
|
|
| 2018 | 19 |
9.7%
|
|
| 2019 | 30 |
15.4%
|
|
| 2020 | 31 |
15.9%
|
|
| 2021 | 13 |
6.7%
|
|
| Sysmiss | 1305 |