| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.6%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1980 | 2 |
1.2%
|
|
| 1984 | 1 |
0.6%
|
|
| 1986 | 3 |
1.7%
|
|
| 1987 | 1 |
0.6%
|
|
| 1989 | 2 |
1.2%
|
|
| 1993 | 2 |
1.2%
|
|
| 1994 | 1 |
0.6%
|
|
| 1995 | 2 |
1.2%
|
|
| 1999 | 2 |
1.2%
|
|
| 2000 | 2 |
1.2%
|
|
| 2001 | 7 |
4%
|
|
| 2002 | 5 |
2.9%
|
|
| 2003 | 6 |
3.5%
|
|
| 2004 | 3 |
1.7%
|
|
| 2005 | 10 |
5.8%
|
|
| 2006 | 4 |
2.3%
|
|
| 2007 | 7 |
4%
|
|
| 2008 | 6 |
3.5%
|
|
| 2009 | 5 |
2.9%
|
|
| 2010 | 9 |
5.2%
|
|
| 2011 | 9 |
5.2%
|
|
| 2012 | 10 |
5.8%
|
|
| 2013 | 12 |
6.9%
|
|
| 2014 | 7 |
4%
|
|
| 2015 | 9 |
5.2%
|
|
| 2016 | 7 |
4%
|
|
| 2017 | 10 |
5.8%
|
|
| 2018 | 7 |
4%
|
|
| 2019 | 8 |
4.6%
|
|
| 2020 | 6 |
3.5%
|
|
| 2021 | 1 |
0.6%
|
|
| 2022 | 4 |
2.3%
|
|
| 2023 | 2 |
1.2%
|