Quarter	Not Specified
1953-01-01	8086.
1953-04-01	7849.
1953-07-01	7621.
1953-10-01	6894.
1954-01-01	7523.
1954-04-01	7057.
1954-07-01	6538.
1954-10-01	6092.
1955-01-01	7799.
1955-04-01	8817.
1955-07-01	9807.
1955-10-01	10735.
1956-01-01	13442.
1956-04-01	13922.
1956-07-01	13445.
1956-10-01	12731.
1957-01-01	14442.
1957-04-01	13688.
1957-07-01	12058.
1957-10-01	11117.
1958-01-01	10163.
1958-04-01	9180.
1958-07-01	8550.
1958-10-01	8105.
1959-01-01	9791.
1959-04-01	10077.
1959-07-01	10182.
1959-10-01	10332.
1960-01-01	11790.
1960-04-01	11074.
1960-07-01	10071.
1960-10-01	9464.
1961-01-01	10305.
1961-04-01	9803.
1961-07-01	9447.
1961-10-01	8991.
1962-01-01	10546.
1962-04-01	10118.
1962-07-01	9720.
1962-10-01	9709.
1963-01-01	10799.
1963-04-01	10926.
1963-07-01	11010.
1963-10-01	11383.
1964-01-01	13659.
1964-04-01	14500.
1964-07-01	14995.
1964-10-01	14650.
1965-01-01	17073.
1965-04-01	17867.
1965-07-01	17992.
1965-10-01	18470.
1966-01-01	26470.
1966-04-01	22349.
1966-07-01	21693.
1966-10-01	20724.