| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 |
0.6%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1946 | 1 |
0%
|
|
| 1952 | 1 |
0%
|
|
| 1960 | 1 |
0%
|
|
| 1964 | 2 |
0.1%
|
|
| 1973 | 1 |
0%
|
|
| 1980 | 2 |
0.1%
|
|
| 1981 | 1 |
0%
|
|
| 1983 | 1 |
0%
|
|
| 1984 | 3 |
0.1%
|
|
| 1985 | 5 |
0.2%
|
|
| 1986 | 3 |
0.1%
|
|
| 1987 | 2 |
0.1%
|
|
| 1988 | 6 |
0.3%
|
|
| 1989 | 3 |
0.1%
|
|
| 1990 | 1 |
0%
|
|
| 1991 | 5 |
0.2%
|
|
| 1992 | 7 |
0.3%
|
|
| 1993 | 25 |
1.1%
|
|
| 1994 | 13 |
0.6%
|
|
| 1995 | 13 |
0.6%
|
|
| 1996 | 24 |
1.1%
|
|
| 1997 | 32 |
1.5%
|
|
| 1998 | 29 |
1.3%
|
|
| 1999 | 35 |
1.6%
|
|
| 2000 | 48 |
2.2%
|
|
| 2001 | 42 |
1.9%
|
|
| 2002 | 66 |
3%
|
|
| 2003 | 87 |
4%
|
|
| 2004 | 84 |
3.8%
|
|
| 2005 | 68 |
3.1%
|
|
| 2006 | 85 |
3.9%
|
|
| 2007 | 64 |
2.9%
|
|
| 2008 | 53 |
2.4%
|
|
| 2009 | 68 |
3.1%
|
|
| 2010 | 68 |
3.1%
|
|
| 2011 | 72 |
3.3%
|
|
| 2012 | 69 |
3.2%
|
|
| 2013 | 85 |
3.9%
|
|
| 2014 | 80 |
3.7%
|
|
| 2015 | 103 |
4.7%
|
|
| 2016 | 97 |
4.4%
|
|
| 2017 | 134 |
6.1%
|
|
| 2018 | 113 |
5.2%
|
|
| 2019 | 120 |
5.5%
|
|
| 2020 | 98 |
4.5%
|
|
| 2021 | 112 |
5.1%
|
|
| 2022 | 75 |
3.4%
|
|
| 2023 | 68 |
3.1%
|
|
| 2024 | 1 |
0%
|