| Value | Category | Cases | |
|---|---|---|---|
| 1951 | 1 |
0%
|
|
| 1956 | 17 |
0.1%
|
|
| 1957 | 145 |
0.5%
|
|
| 1958 | 275 |
1%
|
|
| 1959 | 162 |
0.6%
|
|
| 1960 | 321 |
1.2%
|
|
| 1961 | 549 |
2%
|
|
| 1962 | 151 |
0.6%
|
|
| 1963 | 248 |
0.9%
|
|
| 1964 | 335 |
1.2%
|
|
| 1965 | 382 |
1.4%
|
|
| 1966 | 924 |
3.4%
|
|
| 1967 | 380 |
1.4%
|
|
| 1968 | 784 |
2.9%
|
|
| 1969 | 506 |
1.9%
|
|
| 1970 | 821 |
3%
|
|
| 1971 | 1164 |
4.3%
|
|
| 1972 | 449 |
1.7%
|
|
| 1973 | 477 |
1.8%
|
|
| 1974 | 708 |
2.6%
|
|
| 1975 | 638 |
2.4%
|
|
| 1976 | 1714 |
6.4%
|
|
| 1977 | 685 |
2.5%
|
|
| 1978 | 1319 |
4.9%
|
|
| 1979 | 857 |
3.2%
|
|
| 1980 | 1309 |
4.9%
|
|
| 1981 | 1521 |
5.6%
|
|
| 1982 | 903 |
3.4%
|
|
| 1983 | 837 |
3.1%
|
|
| 1984 | 953 |
3.5%
|
|
| 1985 | 820 |
3%
|
|
| 1986 | 1448 |
5.4%
|
|
| 1987 | 891 |
3.3%
|
|
| 1988 | 1221 |
4.5%
|
|
| 1989 | 806 |
3%
|
|
| 1990 | 1131 |
4.2%
|
|
| 1991 | 248 |
0.9%
|
|
| 9997 | Inconsistent | 2 |
0%
|
| 9998 | DK | 805 |
3%
|
| 9999 | Missing | 16 |
0.1%
|
| Sysmiss | 5676 |