| Value | Category | Cases | |
|---|---|---|---|
| 1970 | 1 |
0%
|
|
| 1971 | 1 |
0%
|
|
| 1972 | 2 |
0%
|
|
| 1973 | 6 |
0%
|
|
| 1974 | 12 |
0.1%
|
|
| 1975 | 16 |
0.1%
|
|
| 1976 | 42 |
0.3%
|
|
| 1977 | 48 |
0.4%
|
|
| 1978 | 81 |
0.6%
|
|
| 1979 | 115 |
0.9%
|
|
| 1980 | 145 |
1.2%
|
|
| 1981 | 96 |
0.8%
|
|
| 1982 | 105 |
0.8%
|
|
| 1983 | 116 |
0.9%
|
|
| 1984 | 137 |
1.1%
|
|
| 1985 | 124 |
1%
|
|
| 1986 | 150 |
1.2%
|
|
| 1987 | 180 |
1.4%
|
|
| 1988 | 141 |
1.1%
|
|
| 1989 | 186 |
1.5%
|
|
| 1990 | 201 |
1.6%
|
|
| 1991 | 218 |
1.7%
|
|
| 1992 | 209 |
1.7%
|
|
| 1993 | 233 |
1.9%
|
|
| 1994 | 265 |
2.1%
|
|
| 1995 | 270 |
2.2%
|
|
| 1996 | 282 |
2.3%
|
|
| 1997 | 322 |
2.6%
|
|
| 1998 | 291 |
2.3%
|
|
| 1999 | 354 |
2.8%
|
|
| 2000 | 404 |
3.2%
|
|
| 2001 | 367 |
2.9%
|
|
| 2002 | 329 |
2.6%
|
|
| 2003 | 409 |
3.3%
|
|
| 2004 | 408 |
3.3%
|
|
| 2005 | 422 |
3.4%
|
|
| 2006 | 412 |
3.3%
|
|
| 2007 | 408 |
3.3%
|
|
| 2008 | 502 |
4%
|
|
| 2009 | 145 |
1.2%
|
|
| 9997 | inconsistent | 16 |
0.1%
|
| 9998 | dk | 117 |
0.9%
|
| 9999 | missing | 33 |
0.3%
|
| Sysmiss | 4167 |
33.4%
|