| Value | Category | Cases | |
|---|---|---|---|
| 1971 | 2 |
0%
|
|
| 1972 | 8 |
0.1%
|
|
| 1973 | 11 |
0.2%
|
|
| 1974 | 23 |
0.4%
|
|
| 1975 | 36 |
0.6%
|
|
| 1976 | 37 |
0.6%
|
|
| 1977 | 95 |
1.6%
|
|
| 1978 | 58 |
0.9%
|
|
| 1979 | 119 |
1.9%
|
|
| 1980 | 130 |
2.1%
|
|
| 1981 | 117 |
1.9%
|
|
| 1982 | 191 |
3.1%
|
|
| 1983 | 174 |
2.8%
|
|
| 1984 | 129 |
2.1%
|
|
| 1985 | 182 |
3%
|
|
| 1986 | 154 |
2.5%
|
|
| 1987 | 220 |
3.6%
|
|
| 1988 | 162 |
2.7%
|
|
| 1989 | 212 |
3.5%
|
|
| 1990 | 198 |
3.2%
|
|
| 1991 | 184 |
3%
|
|
| 1992 | 272 |
4.5%
|
|
| 1993 | 198 |
3.2%
|
|
| 1994 | 194 |
3.2%
|
|
| 1995 | 222 |
3.6%
|
|
| 1996 | 175 |
2.9%
|
|
| 1997 | 261 |
4.3%
|
|
| 1998 | 193 |
3.2%
|
|
| 1999 | 225 |
3.7%
|
|
| 2000 | 239 |
3.9%
|
|
| 2001 | 222 |
3.6%
|
|
| 2002 | 214 |
3.5%
|
|
| 2003 | 240 |
3.9%
|
|
| 2004 | 226 |
3.7%
|
|
| 2005 | 264 |
4.3%
|
|
| 2006 | 246 |
4%
|
|
| 2007 | 259 |
4.2%
|
|
| 9997 | Inconsistent | 20 |
0.3%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 4258 |