1972 1.978730 0.505375 4.7304% 1971 1.881327 0.531540 5.7132% 1970 0.200193 4.995182 5.5272% 1969 4.189684 0.238682 5.5714% 1968 0.439905 2.273219 5.0148% 1967 1.527650 0.654600 2.5719% 1966