Ratio

1976 – Volume 18

1975 – Volume 17

1974 – Volume 16

1973 – Volume 15

1972 – Volume 14

1971 – Volume 13

1970 – Volume 12

1969 – Volume 11

1968 – Volume 10

1967 – Volume 9

1966 – Volume 8

1965 – Volume 7

1964 – Volume 6

1963 – Volume 5

1962 – Volume 4

1960 – Volume 3

1959 – Volume 2

1958 – Volume 1