| Value | Category | Cases | |
|---|---|---|---|
| 1977 | 1 |
0.1%
|
|
| 1980 | 2 |
0.1%
|
|
| 1981 | 4 |
0.2%
|
|
| 1982 | 11 |
0.6%
|
|
| 1983 | 8 |
0.4%
|
|
| 1984 | 21 |
1.1%
|
|
| 1985 | 25 |
1.3%
|
|
| 1986 | 30 |
1.6%
|
|
| 1987 | 36 |
1.9%
|
|
| 1988 | 37 |
1.9%
|
|
| 1989 | 46 |
2.4%
|
|
| 1990 | 43 |
2.3%
|
|
| 1991 | 42 |
2.2%
|
|
| 1992 | 56 |
2.9%
|
|
| 1993 | 53 |
2.8%
|
|
| 1994 | 51 |
2.7%
|
|
| 1995 | 44 |
2.3%
|
|
| 1996 | 51 |
2.7%
|
|
| 1997 | 48 |
2.5%
|
|
| 1998 | 41 |
2.1%
|
|
| 1999 | 54 |
2.8%
|
|
| 2000 | 46 |
2.4%
|
|
| 2001 | 44 |
2.3%
|
|
| 2002 | 41 |
2.1%
|
|
| 2003 | 49 |
2.6%
|
|
| 2004 | 47 |
2.5%
|
|
| 2005 | 34 |
1.8%
|
|
| 2006 | 44 |
2.3%
|
|
| 2007 | 66 |
3.5%
|
|
| 2008 | 50 |
2.6%
|
|
| 2009 | 56 |
2.9%
|
|
| 2010 | 37 |
1.9%
|
|
| 2011 | 55 |
2.9%
|
|
| 2012 | 35 |
1.8%
|
|
| 9998 | DK | 3 |
0.2%
|
| Sysmiss | 598 |
31.3%
|