Quarter	Percentage
1947-01-01	275.800
1947-04-01	275.100
1947-07-01	270.500
1947-10-01	258.500
1948-01-01	268.100
1948-04-01	270.400
1948-07-01	266.400
1948-10-01	260.900
1949-01-01	275.400
1949-04-01	289.300
1949-07-01	296.200
1949-10-01	298.100
1950-01-01	301.300
1950-04-01	294.900
1950-07-01	275.600
1950-10-01	245.600
1951-01-01	239.500
1951-04-01	235.200
1951-07-01	229.800
1951-10-01	219.300
1952-01-01	224.200
1952-04-01	233.600
1952-07-01	228.800
1952-10-01	225.100
1953-01-01	230.300
1953-04-01	231.900
1953-07-01	227.800
1953-10-01	228.700
1954-01-01	238.800
1954-04-01	252.500
1954-07-01	249.600
1954-10-01	242.700
1955-01-01	249.600
1955-04-01	255.400
1955-07-01	247.900
1955-10-01	236.500
1956-01-01	245.300
1956-04-01	250.000
1956-07-01	243.000
1956-10-01	235.500
1957-01-01	238.400
1957-04-01	243.000
1957-07-01	240.900
1957-10-01	243.000
1958-01-01	254.200
1958-04-01	262.000
1958-07-01	262.500
1958-10-01	262.900
1959-01-01	260.300
1959-04-01	254.300
1959-07-01	255.800
1959-10-01	250.900
1960-01-01	249.900
1960-04-01	250.200
1960-07-01	250.300
1960-10-01	251.100
1961-01-01	254.100
1961-04-01	254.800
1961-07-01	253.100
1961-10-01	248.200
1962-01-01	248.400
1962-04-01	246.900
1962-07-01	245.200
1962-10-01	247.200
1963-01-01	248.000
1963-04-01	246.800
1963-07-01	248.000
1963-10-01	245.800
1964-01-01	249.000
1964-04-01	245.400
1964-07-01	243.500
1964-10-01	239.000
1965-01-01	238.400
1965-04-01	235.300
1965-07-01	234.000
1965-10-01	226.700
1966-01-01	225.500
1966-04-01	225.000