| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
0.7%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1958 | 1 |
0.2%
|
|
| 1964 | 1 |
0.2%
|
|
| 1980 | 1 |
0.2%
|
|
| 1990 | 1 |
0.2%
|
|
| 1991 | 2 |
0.3%
|
|
| 1992 | 1 |
0.2%
|
|
| 1993 | 3 |
0.5%
|
|
| 1994 | 5 |
0.8%
|
|
| 1995 | 6 |
1%
|
|
| 1996 | 24 |
4.1%
|
|
| 1997 | 4 |
0.7%
|
|
| 1998 | 9 |
1.5%
|
|
| 1999 | 8 |
1.4%
|
|
| 2000 | 8 |
1.4%
|
|
| 2001 | 11 |
1.9%
|
|
| 2002 | 11 |
1.9%
|
|
| 2003 | 10 |
1.7%
|
|
| 2004 | 11 |
1.9%
|
|
| 2005 | 20 |
3.4%
|
|
| 2006 | 17 |
2.9%
|
|
| 2007 | 29 |
4.9%
|
|
| 2008 | 24 |
4.1%
|
|
| 2009 | 22 |
3.7%
|
|
| 2010 | 19 |
3.2%
|
|
| 2011 | 30 |
5.1%
|
|
| 2012 | 34 |
5.7%
|
|
| 2013 | 33 |
5.6%
|
|
| 2014 | 39 |
6.6%
|
|
| 2015 | 29 |
4.9%
|
|
| 2016 | 43 |
7.3%
|
|
| 2017 | 29 |
4.9%
|
|
| 2018 | 40 |
6.8%
|
|
| 2019 | 25 |
4.2%
|
|
| 2020 | 18 |
3%
|
|
| 2021 | 16 |
2.7%
|
|
| 2022 | 4 |
0.7%
|