| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.9%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1995 | 1 |
0.9%
|
|
| 1998 | 1 |
0.9%
|
|
| 1999 | 2 |
1.8%
|
|
| 2000 | 7 |
6.3%
|
|
| 2001 | 1 |
0.9%
|
|
| 2002 | 2 |
1.8%
|
|
| 2004 | 1 |
0.9%
|
|
| 2005 | 6 |
5.4%
|
|
| 2006 | 5 |
4.5%
|
|
| 2007 | 5 |
4.5%
|
|
| 2008 | 7 |
6.3%
|
|
| 2009 | 5 |
4.5%
|
|
| 2010 | 11 |
9.9%
|
|
| 2011 | 4 |
3.6%
|
|
| 2012 | 15 |
13.5%
|
|
| 2013 | 8 |
7.2%
|
|
| 2014 | 10 |
9%
|
|
| 2015 | 13 |
11.7%
|
|
| 2016 | 3 |
2.7%
|
|
| 2017 | 2 |
1.8%
|
|
| 2018 | 1 |
0.9%
|