| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
1.4%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1953 | 1 |
0.1%
|
|
| 1963 | 1 |
0.1%
|
|
| 1965 | 1 |
0.1%
|
|
| 1967 | 1 |
0.1%
|
|
| 1970 | 1 |
0.1%
|
|
| 1972 | 1 |
0.1%
|
|
| 1973 | 1 |
0.1%
|
|
| 1974 | 1 |
0.1%
|
|
| 1976 | 2 |
0.3%
|
|
| 1978 | 1 |
0.1%
|
|
| 1981 | 1 |
0.1%
|
|
| 1982 | 2 |
0.3%
|
|
| 1983 | 1 |
0.1%
|
|
| 1984 | 2 |
0.3%
|
|
| 1986 | 1 |
0.1%
|
|
| 1987 | 2 |
0.3%
|
|
| 1988 | 3 |
0.4%
|
|
| 1989 | 1 |
0.1%
|
|
| 1990 | 2 |
0.3%
|
|
| 1991 | 1 |
0.1%
|
|
| 1992 | 3 |
0.4%
|
|
| 1993 | 10 |
1.4%
|
|
| 1994 | 1 |
0.1%
|
|
| 1995 | 5 |
0.7%
|
|
| 1996 | 5 |
0.7%
|
|
| 1997 | 5 |
0.7%
|
|
| 1998 | 5 |
0.7%
|
|
| 1999 | 3 |
0.4%
|
|
| 2000 | 17 |
2.4%
|
|
| 2001 | 20 |
2.8%
|
|
| 2002 | 11 |
1.5%
|
|
| 2003 | 16 |
2.2%
|
|
| 2004 | 11 |
1.5%
|
|
| 2005 | 18 |
2.5%
|
|
| 2006 | 19 |
2.7%
|
|
| 2007 | 25 |
3.5%
|
|
| 2008 | 39 |
5.5%
|
|
| 2009 | 20 |
2.8%
|
|
| 2010 | 34 |
4.8%
|
|
| 2011 | 17 |
2.4%
|
|
| 2012 | 37 |
5.2%
|
|
| 2013 | 35 |
4.9%
|
|
| 2014 | 44 |
6.2%
|
|
| 2015 | 53 |
7.4%
|
|
| 2016 | 43 |
6%
|
|
| 2017 | 24 |
3.4%
|
|
| 2018 | 53 |
7.4%
|
|
| 2019 | 41 |
5.8%
|
|
| 2020 | 28 |
3.9%
|
|
| 2021 | 22 |
3.1%
|
|
| 2022 | 12 |
1.7%
|