Quarter	Per Cent
1920-01-01	96.0000
1920-04-01	96.2000
1920-07-01	91.3000
1920-10-01	69.6000
1921-01-01	70.7000
1921-04-01	58.5000
1921-07-01	63.4000
1921-10-01	65.9000
1922-01-01	74.6000
1922-04-01	81.5000
1922-07-01	90.8000
1922-10-01	93.9000
1923-01-01	95.7000
1923-04-01	96.9000
1923-07-01	87.2000
1923-10-01	86.2000
1924-01-01	90.4000
1924-04-01	84.3000
1924-07-01	85.3000
1924-10-01	87.9000
1925-01-01	95.3000
1925-04-01	93.4000
1925-07-01	94.1000
1925-10-01	92.8000
1926-01-01	93.6000
1926-04-01	93.7000
1926-07-01	94.4000
1926-10-01	92.8000
1927-01-01	92.1000
1927-04-01	86.9000
1927-07-01	90.1000
1927-10-01	84.8000
1928-01-01	88.3000
1928-04-01	91.1000
1928-07-01	90.6000
1928-10-01	93.4000
1929-01-01	92.1000
1929-04-01	94.1000
1929-07-01	94.3000
1929-10-01	89.8000
1930-01-01	84.1000
1930-04-01	83.0000
1930-07-01	71.6000
1930-10-01	65.2000
1931-01-01	67.2000
1931-04-01	63.1000
1931-07-01	59.3000
1931-10-01	50.9000
1932-01-01	45.7000
1932-04-01	40.2000
1932-07-01	39.5000
1932-10-01	41.8000
1933-01-01	38.6000
1933-04-01	52.3000
1933-07-01	70.0000
1933-10-01	64.6000
1934-01-01	69.7000
1934-04-01	72.2000
1934-07-01	64.4000
1934-10-01	65.6000
1935-01-01	74.7000
1935-04-01	76.2000
1935-07-01	78.9000
1935-10-01	87.9000
1936-01-01	84.8000
1936-04-01	88.3000
1936-07-01	89.4000
1936-10-01	89.0000
1937-01-01	90.3000
1937-04-01	89.5000
1937-07-01	85.7000
1937-10-01	75.1000
1938-01-01	61.5000
1938-04-01	56.0000
1938-07-01	68.1000
1938-10-01	77.8000
1946-01-01	82.3000
1946-04-01	93.6000
1946-07-01	95.5000
1946-10-01	95.6000
1947-01-01	95.9000
1947-04-01	96.0000
1947-07-01	96.3000
1947-10-01	97.4000
1948-01-01	97.4000
1948-04-01	97.8000
1948-07-01	97.8000
1948-10-01	94.2000
1949-01-01	92.2000
1949-04-01	89.3000
1949-07-01	89.6000
1949-10-01	92.6000
1950-01-01	94.9000
1950-04-01	96.4000
1950-07-01	98.2000
1950-10-01	98.2000
1951-01-01	97.3000
1951-04-01	97.1000
1951-07-01	96.7000
1951-10-01	95.9000
1952-01-01	96.1000
1952-04-01	95.2000
1952-07-01	96.4000
1952-10-01	97.2000
1953-01-01	96.2000
1953-04-01	97.1000
1953-07-01	96.1000
1953-10-01	95.3000
1954-01-01	92.8000
1954-04-01	95.6000
1954-07-01	93.8000
1954-10-01	93.0000
1955-01-01	95.1000
1955-04-01	95.7000
1955-07-01	95.6000
1955-10-01	95.2000
1956-01-01	96.5000
1956-04-01	96.1000
1956-07-01	97.2000
1956-10-01	96.9000
1957-01-01	97.7000
1957-04-01	97.4000
1957-07-01	95.9000
1957-10-01	91.9000
1958-01-01	92.1000
1958-04-01	91.6000
1958-07-01	93.9000
1958-10-01	94.6000
1959-01-01	96.8000
1959-04-01	98.0000
1959-07-01	94.2000
1959-10-01	95.8000
1960-01-01	96.2000
1960-04-01	95.9000
1960-07-01	93.2000
1960-10-01	91.9000
1961-01-01	89.8000
1961-04-01	97.3000
1961-07-01	95.0000
1961-10-01	95.4000
1962-01-01	95.0000
1962-04-01	96.8000
1962-07-01	95.1000
1962-10-01	95.2000
1963-01-01	92.9000
1963-04-01	97.3000