| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 2 |
0.1%
|
|
| 1981 | 3 |
0.1%
|
|
| 1982 | 7 |
0.2%
|
|
| 1983 | 18 |
0.6%
|
|
| 1984 | 22 |
0.8%
|
|
| 1985 | 34 |
1.2%
|
|
| 1986 | 32 |
1.1%
|
|
| 1987 | 36 |
1.3%
|
|
| 1988 | 51 |
1.8%
|
|
| 1989 | 61 |
2.1%
|
|
| 1990 | 64 |
2.2%
|
|
| 1991 | 56 |
2%
|
|
| 1992 | 47 |
1.6%
|
|
| 1993 | 55 |
1.9%
|
|
| 1994 | 83 |
2.9%
|
|
| 1995 | 88 |
3.1%
|
|
| 1996 | 99 |
3.5%
|
|
| 1997 | 109 |
3.8%
|
|
| 1998 | 118 |
4.1%
|
|
| 1999 | 102 |
3.6%
|
|
| 2000 | 154 |
5.4%
|
|
| 2001 | 123 |
4.3%
|
|
| 2002 | 139 |
4.8%
|
|
| 2003 | 135 |
4.7%
|
|
| 2004 | 169 |
5.9%
|
|
| 2005 | 188 |
6.6%
|
|
| 2006 | 169 |
5.9%
|
|
| 2007 | 211 |
7.4%
|
|
| 2008 | 199 |
6.9%
|
|
| 2009 | 135 |
4.7%
|
|
| 2010 | 75 |
2.6%
|
|
| 2011 | 38 |
1.3%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 43 |
1.5%
|
| 9999 | Missing | 2 |
0.1%
|
| Sysmiss | 1851 |