Quarter	Thousands Of Tons
1920-01-01	13561.0
1920-04-01	13574.0
1920-07-01	13910.0
1920-10-01	11939.0
1921-01-01	9883.00
1921-04-01	10628.0
1921-07-01	11134.0
1921-10-01	10435.0
1922-01-01	9800.00
1922-04-01	11037.0
1922-07-01	11020.0
1922-10-01	11320.0
1923-01-01	10503.0
1923-04-01	11652.0
1923-07-01	11201.0
1923-10-01	10958.0
1924-01-01	9876.00
1924-04-01	10290.0
1924-07-01	10042.0
1924-10-01	10444.0
1925-01-01	9665.00
1925-04-01	10092.0
1925-07-01	10435.0
1925-10-01	10387.0
1926-01-01	9479.00
1926-04-01	10047.0
1926-07-01	9968.00
1926-10-01	10002.0
1927-01-01	9069.00
1927-04-01	9835.00
1927-07-01	9974.00
1927-10-01	9555.00
1928-01-01	8826.00
1928-04-01	9251.00
1928-07-01	9342.00
1928-10-01	9465.00
1929-01-01	8435.00
1929-04-01	9265.00
1929-07-01	9495.00
1929-10-01	8824.00
1930-01-01	7573.00
1930-04-01	7882.00
1930-07-01	7360.00
1930-10-01	6851.00
1931-01-01	5836.00
1931-04-01	6216.00
1931-07-01	5632.00
1931-10-01	5089.00
1932-01-01	4077.00
1932-04-01	3916.00
1932-07-01	3594.00
1932-10-01	3646.00
1933-01-01	2973.00
1933-04-01	3698.00
1933-07-01	4097.00
1933-10-01	3583.00
1934-01-01	3448.00
1934-04-01	3723.00
1934-07-01	3616.00
1934-10-01	3559.00
1935-01-01	3230.00
1935-04-01	3503.00
1935-07-01	3625.00
1935-10-01	3678.00
1936-01-01	3436.00
1936-04-01	4071.00
1936-07-01	4366.00
1936-10-01	4424.00
1937-01-01	4139.00
1937-04-01	4522.00
1937-07-01	4484.00
1937-10-01	4044.00
1938-01-01	3360.00
1938-04-01	3525.00
1938-07-01	3750.00
1938-10-01	3763.00
1939-01-01	3384.00
1939-04-01	3655.00
1939-07-01	3954.00
1939-10-01	3971.00
1940-01-01	3308.00
1940-04-01	3546.00
1940-07-01	3754.00
1940-10-01	4084.00
1941-01-01	3786.00
1941-04-01	4612.00
1941-07-01	4924.00
1941-10-01	4768.00
1942-01-01	4428.00
1942-04-01	4412.00
1942-07-01	4244.00
1942-10-01	4492.00
1943-01-01	4407.00
1943-04-01	5016.00
1943-07-01	4931.00