| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 2 |
1%
|
|
| 1983 | 4 |
2%
|
|
| 1984 | 1 |
0.5%
|
|
| 1985 | 4 |
2%
|
|
| 1986 | 2 |
1%
|
|
| 1993 | 28 |
14%
|
|
| 1997 | 9 |
4.5%
|
|
| 1998 | 9 |
4.5%
|
|
| 1999 | 8 |
4%
|
|
| 2000 | 3 |
1.5%
|
|
| 2001 | 2 |
1%
|
|
| 2002 | 1 |
0.5%
|
|
| 2003 | 4 |
2%
|
|
| 2004 | 2 |
1%
|
|
| 2005 | 1 |
0.5%
|
|
| 2008 | 3 |
1.5%
|
|
| 2010 | 24 |
12%
|
|
| 2011 | 2 |
1%
|
|
| 2012 | 22 |
11%
|
|
| 2013 | 9 |
4.5%
|
|
| 2014 | 10 |
5%
|
|
| 2015 | 6 |
3%
|
|
| 2016 | 19 |
9.5%
|
|
| 2017 | 5 |
2.5%
|
|
| Missing value | 20 |
10%
|