4.7304% 1971 0.703644 1.421173 5.7132% 1970 5.675640 0.176192 5.5272% 1969 0.280814 3.561082 5.5714% 1968 5.544156 0.180370 5.0148% 1967 1.527650 0.654600 2.5719% 1966 4.321127 0.231421 3.5485% 1965 0.359577 2.781045 2.7360% 1964 4.569209 0.218856 1.5423% 1963 0.771432 1.296291 1.5697% 1962 0.184990 5.405689 2.2421% 1961 5.199916 0.192311 0.9709% 1960 2.102061 0.475724 1.6442% 1959 0.292592 3.417732 2.3579% 1958 0.746221 1.340086 2.0623% 1957 0.625800 1.597954 3.5571% 1956 0.965651 1.035571 3.3098% 1955 0.272000 3.676476 3.4226% 1954 3.602813 0.277561 1.5421% 1953 0.205559 4.864789 1.5700% 1952 0.202381 4.941175 1.5948% 1951 3.438405 0.290833 5.0183% 1950 3.274100 0.305427 1.7034% 1949
toughens