| Value | Category | Cases | |
|---|---|---|---|
| 1962 | 8 |
0.3%
|
|
| 1963 | 39 |
1.3%
|
|
| 1964 | 52 |
1.8%
|
|
| 1965 | 24 |
0.8%
|
|
| 1966 | 50 |
1.7%
|
|
| 1967 | 46 |
1.6%
|
|
| 1968 | 37 |
1.3%
|
|
| 1969 | 33 |
1.1%
|
|
| 1970 | 69 |
2.4%
|
|
| 1971 | 39 |
1.3%
|
|
| 1972 | 84 |
2.9%
|
|
| 1973 | 32 |
1.1%
|
|
| 1974 | 59 |
2%
|
|
| 1975 | 54 |
1.9%
|
|
| 1976 | 46 |
1.6%
|
|
| 1977 | 70 |
2.4%
|
|
| 1978 | 57 |
2%
|
|
| 1979 | 62 |
2.1%
|
|
| 1980 | 74 |
2.6%
|
|
| 1981 | 42 |
1.4%
|
|
| 1982 | 103 |
3.6%
|
|
| 1983 | 53 |
1.8%
|
|
| 1984 | 79 |
2.7%
|
|
| 1985 | 65 |
2.2%
|
|
| 1986 | 87 |
3%
|
|
| 1987 | 110 |
3.8%
|
|
| 1988 | 92 |
3.2%
|
|
| 1989 | 77 |
2.7%
|
|
| 1990 | 102 |
3.5%
|
|
| 1991 | 89 |
3.1%
|
|
| 1992 | 133 |
4.6%
|
|
| 1993 | 102 |
3.5%
|
|
| 1994 | 146 |
5%
|
|
| 1995 | 115 |
4%
|
|
| 1996 | 159 |
5.5%
|
|
| 1997 | 93 |
3.2%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 315 |
10.9%
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 229 |