6.199691 0.161298 4.7304% 1971 6.166311 0.162172 5.7132% 1970 5.753620 0.173804 5.5272% 1969 2.618496 0.381899 5.5714% 1968 0.131302 7.616025 5.0148% 1967 3.779067 0.264616 2.5719% 1966 5.000090 0.199996 3.5485% 1965 2.299350 0.434905 2.7360% 1964 2.082316 0.480235 1.5423% 1963 0.257146 3.888841 1.5697% 1962 0.943770 1.059580 2.2421% 1961 3.852029 0.259603 0.9709% 1960 0.968666 1.032348 1.6442% 1959 0.304002 3.289449 2.3579% 1958 4.124768 0.242438
spread