| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.7%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1957 | 1 |
0.8%
|
|
| 1960 | 1 |
0.8%
|
|
| 1964 | 1 |
0.8%
|
|
| 1970 | 1 |
0.8%
|
|
| 1973 | 1 |
0.8%
|
|
| 1975 | 5 |
4.2%
|
|
| 1976 | 1 |
0.8%
|
|
| 1977 | 1 |
0.8%
|
|
| 1978 | 1 |
0.8%
|
|
| 1979 | 2 |
1.7%
|
|
| 1980 | 5 |
4.2%
|
|
| 1981 | 3 |
2.5%
|
|
| 1982 | 3 |
2.5%
|
|
| 1983 | 2 |
1.7%
|
|
| 1984 | 1 |
0.8%
|
|
| 1985 | 2 |
1.7%
|
|
| 1986 | 1 |
0.8%
|
|
| 1987 | 1 |
0.8%
|
|
| 1989 | 3 |
2.5%
|
|
| 1991 | 2 |
1.7%
|
|
| 1992 | 4 |
3.3%
|
|
| 1993 | 1 |
0.8%
|
|
| 1994 | 3 |
2.5%
|
|
| 1995 | 4 |
3.3%
|
|
| 1996 | 4 |
3.3%
|
|
| 1997 | 4 |
3.3%
|
|
| 1998 | 2 |
1.7%
|
|
| 1999 | 6 |
5%
|
|
| 2000 | 4 |
3.3%
|
|
| 2001 | 1 |
0.8%
|
|
| 2002 | 5 |
4.2%
|
|
| 2003 | 1 |
0.8%
|
|
| 2004 | 8 |
6.7%
|
|
| 2005 | 5 |
4.2%
|
|
| 2006 | 4 |
3.3%
|
|
| 2007 | 4 |
3.3%
|
|
| 2009 | 3 |
2.5%
|
|
| 2010 | 3 |
2.5%
|
|
| 2011 | 1 |
0.8%
|
|
| 2012 | 6 |
5%
|
|
| 2013 | 3 |
2.5%
|
|
| 2014 | 2 |
1.7%
|
|
| 2015 | 1 |
0.8%
|
|
| 2016 | 1 |
0.8%
|