| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.4%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1851 | 1 |
0.1%
|
|
| 1889 | 1 |
0.1%
|
|
| 1905 | 1 |
0.1%
|
|
| 1909 | 1 |
0.1%
|
|
| 1951 | 1 |
0.1%
|
|
| 1963 | 2 |
0.2%
|
|
| 1972 | 1 |
0.1%
|
|
| 1977 | 1 |
0.1%
|
|
| 1981 | 1 |
0.1%
|
|
| 1982 | 1 |
0.1%
|
|
| 1984 | 1 |
0.1%
|
|
| 1986 | 1 |
0.1%
|
|
| 1987 | 1 |
0.1%
|
|
| 1989 | 15 |
1.8%
|
|
| 1990 | 20 |
2.4%
|
|
| 1991 | 46 |
5.4%
|
|
| 1992 | 23 |
2.7%
|
|
| 1993 | 38 |
4.5%
|
|
| 1994 | 20 |
2.4%
|
|
| 1995 | 31 |
3.6%
|
|
| 1996 | 29 |
3.4%
|
|
| 1997 | 40 |
4.7%
|
|
| 1998 | 26 |
3.1%
|
|
| 1999 | 28 |
3.3%
|
|
| 2000 | 33 |
3.9%
|
|
| 2001 | 26 |
3.1%
|
|
| 2002 | 29 |
3.4%
|
|
| 2003 | 25 |
2.9%
|
|
| 2004 | 16 |
1.9%
|
|
| 2005 | 26 |
3.1%
|
|
| 2006 | 30 |
3.5%
|
|
| 2007 | 20 |
2.4%
|
|
| 2008 | 26 |
3.1%
|
|
| 2009 | 33 |
3.9%
|
|
| 2010 | 39 |
4.6%
|
|
| 2011 | 27 |
3.2%
|
|
| 2012 | 17 |
2%
|
|
| 2013 | 28 |
3.3%
|
|
| 2014 | 20 |
2.4%
|
|
| 2015 | 22 |
2.6%
|
|
| 2016 | 17 |
2%
|
|
| 2017 | 21 |
2.5%
|
|
| 2018 | 13 |
1.5%
|
|
| 2019 | 13 |
1.5%
|
|
| 2020 | 13 |
1.5%
|
|
| 2021 | 10 |
1.2%
|
|
| 2022 | 13 |
1.5%
|