| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 117 |
11.7%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1957 | 1 |
0.1%
|
|
| 1967 | 1 |
0.1%
|
|
| 1970 | 2 |
0.2%
|
|
| 1975 | 1 |
0.1%
|
|
| 1979 | 1 |
0.1%
|
|
| 1980 | 2 |
0.2%
|
|
| 1984 | 2 |
0.2%
|
|
| 1985 | 2 |
0.2%
|
|
| 1987 | 1 |
0.1%
|
|
| 1988 | 1 |
0.1%
|
|
| 1990 | 6 |
0.6%
|
|
| 1991 | 2 |
0.2%
|
|
| 1992 | 3 |
0.3%
|
|
| 1993 | 1 |
0.1%
|
|
| 1994 | 1 |
0.1%
|
|
| 1995 | 11 |
1.1%
|
|
| 1996 | 2 |
0.2%
|
|
| 1998 | 3 |
0.3%
|
|
| 1999 | 7 |
0.7%
|
|
| 2000 | 32 |
3.2%
|
|
| 2001 | 7 |
0.7%
|
|
| 2002 | 3 |
0.3%
|
|
| 2003 | 8 |
0.8%
|
|
| 2004 | 14 |
1.4%
|
|
| 2005 | 28 |
2.8%
|
|
| 2006 | 13 |
1.3%
|
|
| 2007 | 8 |
0.8%
|
|
| 2008 | 26 |
2.6%
|
|
| 2009 | 20 |
2%
|
|
| 2010 | 58 |
5.8%
|
|
| 2011 | 29 |
2.9%
|
|
| 2012 | 51 |
5.1%
|
|
| 2013 | 47 |
4.7%
|
|
| 2014 | 51 |
5.1%
|
|
| 2015 | 94 |
9.4%
|
|
| 2016 | 87 |
8.7%
|
|
| 2017 | 149 |
14.9%
|
|
| 2018 | 106 |
10.6%
|