| value | category | cases | |
|---|---|---|---|
| 1968 | 6 |
0.1%
|
|
| 1969 | 5 |
0.1%
|
|
| 1970 | 12 |
0.1%
|
|
| 1971 | 8 |
0.1%
|
|
| 1972 | 2 |
0%
|
|
| 1973 | 30 |
0.4%
|
|
| 1974 | 43 |
0.5%
|
|
| 1975 | 69 |
0.8%
|
|
| 1976 | 27 |
0.3%
|
|
| 1977 | 74 |
0.9%
|
|
| 1978 | 48 |
0.6%
|
|
| 1979 | 139 |
1.7%
|
|
| 1980 | 141 |
1.7%
|
|
| 1981 | 115 |
1.4%
|
|
| 1982 | 179 |
2.2%
|
|
| 1983 | 187 |
2.3%
|
|
| 1984 | 169 |
2.1%
|
|
| 1985 | 168 |
2%
|
|
| 1986 | 208 |
2.5%
|
|
| 1987 | 199 |
2.4%
|
|
| 1988 | 327 |
4%
|
|
| 1989 | 221 |
2.7%
|
|
| 1990 | 246 |
3%
|
|
| 1991 | 278 |
3.4%
|
|
| 1992 | 296 |
3.6%
|
|
| 1993 | 362 |
4.4%
|
|
| 1994 | 328 |
4%
|
|
| 1995 | 474 |
5.8%
|
|
| 1996 | 478 |
5.8%
|
|
| 1997 | 448 |
5.4%
|
|
| 1998 | 526 |
6.4%
|
|
| 1999 | 532 |
6.5%
|
|
| 2000 | 518 |
6.3%
|
|
| 2001 | 486 |
5.9%
|
|
| 2002 | 403 |
4.9%
|
|
| 2003 | 479 |
5.8%
|
|
| 9997 | Inconsistent | 4 |
0%
|
| 9998 | DK | 0 |
0%
|
| 9999 | 3 | ||
| Sysmiss | 33282 |