| Value | Category | Cases | |
|---|---|---|---|
| 1964 | 76 |
0.3%
|
|
| 1965 | 328 |
1.1%
|
|
| 1966 | 275 |
0.9%
|
|
| 1967 | 249 |
0.8%
|
|
| 1968 | 397 |
1.3%
|
|
| 1969 | 313 |
1%
|
|
| 1970 | 469 |
1.6%
|
|
| 1971 | 306 |
1%
|
|
| 1972 | 348 |
1.2%
|
|
| 1973 | 392 |
1.3%
|
|
| 1974 | 426 |
1.4%
|
|
| 1975 | 493 |
1.6%
|
|
| 1976 | 404 |
1.4%
|
|
| 1977 | 350 |
1.2%
|
|
| 1978 | 634 |
2.1%
|
|
| 1979 | 530 |
1.8%
|
|
| 1980 | 624 |
2.1%
|
|
| 1981 | 476 |
1.6%
|
|
| 1982 | 693 |
2.3%
|
|
| 1983 | 649 |
2.2%
|
|
| 1984 | 737 |
2.5%
|
|
| 1985 | 735 |
2.5%
|
|
| 1986 | 822 |
2.7%
|
|
| 1987 | 747 |
2.5%
|
|
| 1988 | 1023 |
3.4%
|
|
| 1989 | 849 |
2.8%
|
|
| 1990 | 870 |
2.9%
|
|
| 1991 | 749 |
2.5%
|
|
| 1992 | 865 |
2.9%
|
|
| 1993 | 881 |
2.9%
|
|
| 1994 | 965 |
3.2%
|
|
| 1995 | 960 |
3.2%
|
|
| 1996 | 1022 |
3.4%
|
|
| 1997 | 930 |
3.1%
|
|
| 1998 | 1015 |
3.4%
|
|
| 1999 | 440 |
1.5%
|
|
| 9997 | Inconsistent | 83 |
0.3%
|
| 9998 | DK | 4513 |
15.1%
|
| 9999 | Missing | 9 |
0%
|
| Sysmiss | 3251 |
10.9%
|