| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.2%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1936 | 1 |
0.1%
|
|
| 1942 | 1 |
0.1%
|
|
| 1946 | 2 |
0.2%
|
|
| 1961 | 1 |
0.1%
|
|
| 1991 | 4 |
0.4%
|
|
| 1992 | 6 |
0.6%
|
|
| 1993 | 8 |
0.8%
|
|
| 1994 | 5 |
0.5%
|
|
| 1995 | 17 |
1.7%
|
|
| 1996 | 11 |
1.1%
|
|
| 1997 | 15 |
1.5%
|
|
| 1998 | 26 |
2.6%
|
|
| 1999 | 22 |
2.2%
|
|
| 2000 | 18 |
1.8%
|
|
| 2001 | 26 |
2.6%
|
|
| 2002 | 29 |
2.9%
|
|
| 2003 | 35 |
3.5%
|
|
| 2004 | 46 |
4.5%
|
|
| 2005 | 39 |
3.8%
|
|
| 2006 | 37 |
3.7%
|
|
| 2007 | 36 |
3.6%
|
|
| 2008 | 34 |
3.4%
|
|
| 2009 | 38 |
3.8%
|
|
| 2010 | 34 |
3.4%
|
|
| 2011 | 43 |
4.2%
|
|
| 2012 | 26 |
2.6%
|
|
| 2013 | 39 |
3.8%
|
|
| 2014 | 53 |
5.2%
|
|
| 2015 | 47 |
4.6%
|
|
| 2016 | 47 |
4.6%
|
|
| 2017 | 55 |
5.4%
|
|
| 2018 | 31 |
3.1%
|
|
| 2019 | 33 |
3.3%
|
|
| 2020 | 33 |
3.3%
|
|
| 2021 | 40 |
3.9%
|
|
| 2022 | 43 |
4.2%
|
|
| 2023 | 30 |
3%
|