Quarter	Percentage
1947-01-01	219.700
1947-04-01	220.500
1947-07-01	216.400
1947-10-01	207.100
1948-01-01	207.200
1948-04-01	214.400
1948-07-01	208.500
1948-10-01	205.800
1949-01-01	216.800
1949-04-01	228.400
1949-07-01	233.000
1949-10-01	239.600
1950-01-01	241.500
1950-04-01	238.600
1950-07-01	223.900
1950-10-01	199.700
1951-01-01	191.400
1951-04-01	185.200
1951-07-01	179.400
1951-10-01	170.400
1952-01-01	172.700
1952-04-01	179.300
1952-07-01	173.200
1952-10-01	168.200
1953-01-01	171.800
1953-04-01	172.600
1953-07-01	168.500
1953-10-01	172.400
1954-01-01	182.100
1954-04-01	194.500
1954-07-01	191.700
1954-10-01	187.300
1955-01-01	190.100
1955-04-01	194.500
1955-07-01	188.300
1955-10-01	179.100
1956-01-01	185.700
1956-04-01	188.300
1956-07-01	183.000
1956-10-01	177.000
1957-01-01	179.300
1957-04-01	185.100
1957-07-01	183.500
1957-10-01	186.600
1958-01-01	195.400
1958-04-01	200.800
1958-07-01	199.100
1958-10-01	198.000
1959-01-01	196.900
1959-04-01	193.000
1959-07-01	194.700
1959-10-01	190.900
1960-01-01	190.700
1960-04-01	189.500
1960-07-01	190.400
1960-10-01	190.100
1961-01-01	192.100
1961-04-01	190.700
1961-07-01	188.300
1961-10-01	183.900
1962-01-01	184.100
1962-04-01	182.100
1962-07-01	179.900
1962-10-01	179.500
1963-01-01	179.500
1963-04-01	178.100
1963-07-01	177.400
1963-10-01	174.600
1964-01-01	176.900
1964-04-01	175.900
1964-07-01	175.100
1964-10-01	170.100
1965-01-01	164.800
1965-04-01	162.100
1965-07-01	160.200
1965-10-01	154.800
1966-01-01	151.700
1966-04-01	149.900
1966-07-01	148.200
1966-10-01	143.100
1967-01-01	143.300
1967-04-01	143.800
1967-07-01	142.600
1967-10-01	139.000
1968-01-01	135.900
1968-04-01	132.700
1968-07-01	131.300
1968-10-01	128.500
1969-01-01	126.900