Quarter	Percentage
1947-01-01	493.400
1947-04-01	516.700
1947-07-01	514.000
1947-10-01	504.500
1948-01-01	518.700
1948-04-01	521.800
1948-07-01	518.100
1948-10-01	503.100
1949-01-01	514.000
1949-04-01	527.300
1949-07-01	525.500
1949-10-01	505.100
1950-01-01	505.300
1950-04-01	526.800
1950-07-01	527.000
1950-10-01	487.000
1951-01-01	505.600
1951-04-01	483.000
1951-07-01	466.100
1951-10-01	454.900
1952-01-01	441.200
1952-04-01	445.800
1952-07-01	409.600
1952-10-01	420.000
1953-01-01	430.200
1953-04-01	444.800
1953-07-01	435.400
1953-10-01	431.100
1954-01-01	402.100
1954-04-01	412.500
1954-07-01	399.500
1954-10-01	394.900
1955-01-01	405.300
1955-04-01	424.600
1955-07-01	413.900
1955-10-01	403.100
1956-01-01	411.500
1956-04-01	412.500
1956-07-01	391.400
1956-10-01	398.800
1957-01-01	405.500
1957-04-01	414.200
1957-07-01	409.300
1957-10-01	409.100
1958-01-01	408.500
1958-04-01	417.900
1958-07-01	416.000
1958-10-01	423.300
1959-01-01	413.100
1959-04-01	429.600
1959-07-01	417.000
1959-10-01	392.400
1960-01-01	399.900
1960-04-01	412.100
1960-07-01	398.700
1960-10-01	393.500
1961-01-01	386.900
1961-04-01	403.300
1961-07-01	386.400
1961-10-01	385.300
1962-01-01	380.600
1962-04-01	392.300
1962-07-01	375.900
1962-10-01	387.000
1963-01-01	371.700
1963-04-01	387.900
1963-07-01	379.800
1963-10-01	378.500
1964-01-01	381.000
1964-04-01	392.400
1964-07-01	375.800
1964-10-01	369.100
1965-01-01	401.500