1965 4.224903 0.236692 2.7360% 1964 4.700148 0.212759 1.5423% 1963 3.951290 0.253082 1.5697% 1962 0.441824 2.263347 2.2421% 1961 4.274100 0.233967 0.9709% 1960 3.961730 0.252415 1.6442% 1959 4.222028 0.236853 2.3579% 1958 3.413869 0.292923 2.0623% 1957 1.159369 0.862538 3.5571% 1956 0.520377 1.921683 3.3098% 1955 0.880256
introduced