Quarter	Percentage
1947-01-01	79.6000
1947-04-01	82.1000
1947-07-01	79.8000
1947-10-01	75.5000
1948-01-01	75.5000
1948-04-01	75.5000
1948-07-01	73.5000
1948-10-01	71.5000
1949-01-01	76.3000
1949-04-01	87.5000
1949-07-01	95.4000
1949-10-01	97.3000
1950-01-01	97.6000
1950-04-01	97.0000
1950-07-01	91.3000
1950-10-01	76.5000
1951-01-01	71.4000
1951-04-01	69.0000
1951-07-01	65.9000
1951-10-01	63.3000
1952-01-01	61.5000
1952-04-01	65.5000
1952-07-01	63.1000
1952-10-01	62.3000
1953-01-01	60.4000
1953-04-01	61.8000
1953-07-01	62.7000
1953-10-01	64.9000
1954-01-01	62.9000
1954-04-01	65.6000
1954-07-01	68.0000
1954-10-01	68.8000
1955-01-01	68.2000
1955-04-01	70.0000
1955-07-01	68.6000
1955-10-01	66.7000
1956-01-01	60.9000
1956-04-01	58.2000
1956-07-01	55.3000
1956-10-01	55.3000
1957-01-01	51.1000
1957-04-01	51.1000
1957-07-01	51.7000
1957-10-01	54.5000
1958-01-01	53.1000
1958-04-01	54.9000
1958-07-01	56.3000
1958-10-01	61.5000
1959-01-01	58.1000
1959-04-01	56.9000
1959-07-01	57.3000
1959-10-01	56.9000
1960-01-01	51.4000
1960-04-01	49.8000
1960-07-01	48.3000
1960-10-01	51.9000
1961-01-01	48.4000
1961-04-01	48.3000
1961-07-01	46.6000
1961-10-01	48.9000
1962-01-01	44.7000
1962-04-01	44.4000
1962-07-01	42.5000
1962-10-01	47.7000
1963-01-01	43.6000
1963-04-01	43.1000
1963-07-01	42.8000
1963-10-01	46.4000
1964-01-01	43.3000
1964-04-01	42.6000
1964-07-01	40.2000
1964-10-01	40.4000
1965-01-01	36.8000