| Value | Category | Cases | |
|---|---|---|---|
| 1954 | 1 |
0.1%
|
|
| 1955 | 13 |
0.9%
|
|
| 1956 | 13 |
0.9%
|
|
| 1957 | 11 |
0.8%
|
|
| 1958 | 15 |
1%
|
|
| 1959 | 6 |
0.4%
|
|
| 1960 | 13 |
0.9%
|
|
| 1961 | 15 |
1%
|
|
| 1962 | 18 |
1.2%
|
|
| 1963 | 15 |
1%
|
|
| 1964 | 26 |
1.8%
|
|
| 1965 | 13 |
0.9%
|
|
| 1966 | 14 |
1%
|
|
| 1967 | 24 |
1.6%
|
|
| 1968 | 24 |
1.6%
|
|
| 1969 | 15 |
1%
|
|
| 1970 | 26 |
1.8%
|
|
| 1971 | 17 |
1.2%
|
|
| 1972 | 25 |
1.7%
|
|
| 1973 | 32 |
2.2%
|
|
| 1974 | 23 |
1.6%
|
|
| 1975 | 27 |
1.9%
|
|
| 1976 | 16 |
1.1%
|
|
| 1977 | 21 |
1.4%
|
|
| 1978 | 37 |
2.5%
|
|
| 1979 | 29 |
2%
|
|
| 1980 | 32 |
2.2%
|
|
| 1981 | 24 |
1.6%
|
|
| 1982 | 24 |
1.6%
|
|
| 1983 | 26 |
1.8%
|
|
| 1984 | 43 |
2.9%
|
|
| 1985 | 36 |
2.5%
|
|
| 1986 | 40 |
2.7%
|
|
| 1987 | 42 |
2.9%
|
|
| 1988 | 51 |
3.5%
|
|
| 1989 | 48 |
3.3%
|
|
| 1990 | 63 |
4.3%
|
|
| 1991 | 49 |
3.4%
|
|
| 1992 | 50 |
3.4%
|
|
| 1993 | 63 |
4.3%
|
|
| 1994 | 60 |
4.1%
|
|
| 1995 | 75 |
5.1%
|
|
| 1996 | 67 |
4.6%
|
|
| 1997 | 62 |
4.2%
|
|
| 1998 | 78 |
5.3%
|
|
| 1999 | 37 |
2.5%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 170 |