| Value | Category | Cases | |
|---|---|---|---|
| 1970 | 1 |
0%
|
|
| 1971 | 1 |
0%
|
|
| 1973 | 1 |
0%
|
|
| 1974 | 1 |
0%
|
|
| 1975 | 2 |
0.1%
|
|
| 1976 | 1 |
0%
|
|
| 1977 | 2 |
0.1%
|
|
| 1978 | 5 |
0.1%
|
|
| 1979 | 5 |
0.1%
|
|
| 1980 | 20 |
0.5%
|
|
| 1981 | 9 |
0.2%
|
|
| 1982 | 17 |
0.4%
|
|
| 1983 | 23 |
0.6%
|
|
| 1984 | 34 |
0.9%
|
|
| 1985 | 47 |
1.2%
|
|
| 1986 | 47 |
1.2%
|
|
| 1987 | 40 |
1%
|
|
| 1988 | 74 |
1.9%
|
|
| 1989 | 78 |
2%
|
|
| 1990 | 153 |
4%
|
|
| 1991 | 92 |
2.4%
|
|
| 1992 | 121 |
3.1%
|
|
| 1993 | 126 |
3.3%
|
|
| 1994 | 129 |
3.3%
|
|
| 1995 | 143 |
3.7%
|
|
| 1996 | 119 |
3.1%
|
|
| 1997 | 84 |
2.2%
|
|
| 1998 | 157 |
4.1%
|
|
| 1999 | 154 |
4%
|
|
| 2000 | 236 |
6.1%
|
|
| 2001 | 146 |
3.8%
|
|
| 2002 | 140 |
3.6%
|
|
| 2003 | 146 |
3.8%
|
|
| 2004 | 144 |
3.7%
|
|
| 2005 | 128 |
3.3%
|
|
| 2006 | 123 |
3.2%
|
|
| 2007 | 125 |
3.2%
|
|
| 2008 | 126 |
3.3%
|
|
| 2009 | 119 |
3.1%
|
|
| 2010 | 92 |
2.4%
|
|
| 2011 | 33 |
0.9%
|
|
| 9997 | Inconsistent | 19 |
0.5%
|
| 9998 | DK | 423 |
11%
|
| 9999 | Missing | 171 |
4.4%
|
| Sysmiss | 1982 |