| Value | Category | Cases | |
|---|---|---|---|
| 1973 | 1 |
0%
|
|
| 1975 | 2 |
0.1%
|
|
| 1976 | 5 |
0.2%
|
|
| 1977 | 7 |
0.2%
|
|
| 1978 | 3 |
0.1%
|
|
| 1979 | 29 |
1%
|
|
| 1980 | 30 |
1%
|
|
| 1981 | 30 |
1%
|
|
| 1982 | 45 |
1.5%
|
|
| 1983 | 40 |
1.3%
|
|
| 1984 | 84 |
2.8%
|
|
| 1985 | 70 |
2.3%
|
|
| 1986 | 91 |
3%
|
|
| 1987 | 119 |
3.9%
|
|
| 1988 | 105 |
3.5%
|
|
| 1989 | 107 |
3.5%
|
|
| 1990 | 112 |
3.7%
|
|
| 1991 | 77 |
2.5%
|
|
| 1992 | 90 |
3%
|
|
| 1993 | 99 |
3.3%
|
|
| 1994 | 96 |
3.2%
|
|
| 1995 | 90 |
3%
|
|
| 1996 | 100 |
3.3%
|
|
| 1997 | 95 |
3.1%
|
|
| 1998 | 84 |
2.8%
|
|
| 1999 | 87 |
2.9%
|
|
| 2000 | 116 |
3.8%
|
|
| 2001 | 77 |
2.5%
|
|
| 2002 | 96 |
3.2%
|
|
| 2003 | 104 |
3.4%
|
|
| 2004 | 100 |
3.3%
|
|
| 2005 | 100 |
3.3%
|
|
| 2006 | 95 |
3.1%
|
|
| 2007 | 105 |
3.5%
|
|
| 2008 | 111 |
3.6%
|
|
| 2009 | 115 |
3.8%
|
|
| 2010 | 122 |
4%
|
|
| 2011 | 28 |
0.9%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 176 |
5.8%
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 2525 |