| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1965 | 1 |
0.1%
|
|
| 1970 | 1 |
0.1%
|
|
| 1975 | 1 |
0.1%
|
|
| 1977 | 1 |
0.1%
|
|
| 1990 | 2 |
0.2%
|
|
| 1991 | 33 |
3.5%
|
|
| 1992 | 67 |
7.1%
|
|
| 1993 | 62 |
6.5%
|
|
| 1994 | 71 |
7.5%
|
|
| 1995 | 23 |
2.4%
|
|
| 1996 | 23 |
2.4%
|
|
| 1997 | 19 |
2%
|
|
| 1998 | 23 |
2.4%
|
|
| 1999 | 28 |
3%
|
|
| 2000 | 25 |
2.6%
|
|
| 2001 | 14 |
1.5%
|
|
| 2002 | 35 |
3.7%
|
|
| 2003 | 43 |
4.5%
|
|
| 2004 | 29 |
3.1%
|
|
| 2005 | 47 |
5%
|
|
| 2006 | 30 |
3.2%
|
|
| 2007 | 27 |
2.9%
|
|
| 2008 | 31 |
3.3%
|
|
| 2009 | 22 |
2.3%
|
|
| 2010 | 28 |
3%
|
|
| 2011 | 33 |
3.5%
|
|
| 2012 | 30 |
3.2%
|
|
| 2013 | 32 |
3.4%
|
|
| 2014 | 28 |
3%
|
|
| 2015 | 21 |
2.2%
|
|
| 2016 | 31 |
3.3%
|
|
| 2017 | 27 |
2.9%
|
|
| 2018 | 22 |
2.3%
|
|
| 2019 | 23 |
2.4%
|
|
| 2020 | 6 |
0.6%
|
|
| 2021 | 8 |
0.8%
|