| Value | Category | Cases | |
|---|---|---|---|
| -9 | do not know | 3 |
2%
|
| -7 | never registered | 0 |
0%
|
| 1978 | 1 |
0.7%
|
|
| 1987 | 1 |
0.7%
|
|
| 1988 | 1 |
0.7%
|
|
| 1993 | 1 |
0.7%
|
|
| 1994 | 1 |
0.7%
|
|
| 1995 | 3 |
2%
|
|
| 1996 | 6 |
4.1%
|
|
| 1998 | 3 |
2%
|
|
| 1999 | 1 |
0.7%
|
|
| 2000 | 4 |
2.7%
|
|
| 2001 | 2 |
1.4%
|
|
| 2002 | 4 |
2.7%
|
|
| 2003 | 2 |
1.4%
|
|
| 2004 | 10 |
6.8%
|
|
| 2005 | 9 |
6.1%
|
|
| 2006 | 13 |
8.8%
|
|
| 2007 | 18 |
12.2%
|
|
| 2008 | 21 |
14.2%
|
|
| 2009 | 40 |
27%
|
|
| 2010 | 4 |
2.7%
|