| Value | Category | Cases | |
|---|---|---|---|
| 1962 | 9 |
0.6%
|
|
| 1963 | 35 |
2.5%
|
|
| 1964 | 32 |
2.3%
|
|
| 1965 | 30 |
2.1%
|
|
| 1966 | 33 |
2.3%
|
|
| 1967 | 44 |
3.1%
|
|
| 1968 | 29 |
2%
|
|
| 1969 | 53 |
3.7%
|
|
| 1970 | 36 |
2.5%
|
|
| 1971 | 38 |
2.7%
|
|
| 1972 | 42 |
3%
|
|
| 1973 | 28 |
2%
|
|
| 1974 | 34 |
2.4%
|
|
| 1975 | 46 |
3.2%
|
|
| 1976 | 40 |
2.8%
|
|
| 1977 | 39 |
2.8%
|
|
| 1978 | 42 |
3%
|
|
| 1979 | 38 |
2.7%
|
|
| 1980 | 40 |
2.8%
|
|
| 1981 | 38 |
2.7%
|
|
| 1982 | 43 |
3%
|
|
| 1983 | 37 |
2.6%
|
|
| 1984 | 39 |
2.8%
|
|
| 1985 | 51 |
3.6%
|
|
| 1986 | 50 |
3.5%
|
|
| 1987 | 37 |
2.6%
|
|
| 1988 | 42 |
3%
|
|
| 1989 | 37 |
2.6%
|
|
| 1990 | 28 |
2%
|
|
| 1991 | 37 |
2.6%
|
|
| 1992 | 37 |
2.6%
|
|
| 1993 | 30 |
2.1%
|
|
| 1994 | 53 |
3.7%
|
|
| 1995 | 54 |
3.8%
|
|
| 1996 | 65 |
4.6%
|
|
| 1997 | 51 |
3.6%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 347 |