| Value | Category | Cases | |
|---|---|---|---|
| 1971 | 1 |
0%
|
|
| 1972 | 2 |
0%
|
|
| 1973 | 2 |
0%
|
|
| 1974 | 6 |
0%
|
|
| 1975 | 16 |
0.1%
|
|
| 1976 | 16 |
0.1%
|
|
| 1977 | 38 |
0.3%
|
|
| 1978 | 56 |
0.4%
|
|
| 1979 | 79 |
0.6%
|
|
| 1980 | 132 |
1.1%
|
|
| 1981 | 127 |
1%
|
|
| 1982 | 120 |
1%
|
|
| 1983 | 139 |
1.1%
|
|
| 1984 | 138 |
1.1%
|
|
| 1985 | 126 |
1%
|
|
| 1986 | 146 |
1.2%
|
|
| 1987 | 158 |
1.3%
|
|
| 1988 | 161 |
1.3%
|
|
| 1989 | 196 |
1.6%
|
|
| 1990 | 189 |
1.5%
|
|
| 1991 | 214 |
1.7%
|
|
| 1992 | 226 |
1.8%
|
|
| 1993 | 210 |
1.7%
|
|
| 1994 | 246 |
2%
|
|
| 1995 | 280 |
2.2%
|
|
| 1996 | 300 |
2.4%
|
|
| 1997 | 309 |
2.5%
|
|
| 1998 | 314 |
2.5%
|
|
| 1999 | 297 |
2.4%
|
|
| 2000 | 363 |
2.9%
|
|
| 2001 | 359 |
2.9%
|
|
| 2002 | 373 |
3%
|
|
| 2003 | 386 |
3.1%
|
|
| 2004 | 434 |
3.5%
|
|
| 2005 | 414 |
3.3%
|
|
| 2006 | 404 |
3.2%
|
|
| 2007 | 433 |
3.5%
|
|
| 2008 | 496 |
4%
|
|
| 2009 | 175 |
1.4%
|
|
| 9997 | inconsistent | 4 |
0%
|
| 9998 | dk | 6 |
0%
|
| 9999 | missing | 3 |
0%
|
| Sysmiss | 4394 |
35.2%
|