Quarter	Millions Of Tons
1920-01-01	275.900
1920-04-01	299.700
1920-07-01	351.100
1920-10-01	328.900
1921-01-01	218.000
1921-04-01	223.600
1921-07-01	252.500
1921-10-01	246.500
1922-01-01	222.600
1922-04-01	218.500
1922-07-01	269.000
1922-10-01	313.000
1923-01-01	284.200
1923-04-01	326.600
1923-07-01	347.300
1923-10-01	319.200
1924-01-01	276.400
1924-04-01	277.300
1924-07-01	312.400
1924-10-01	320.500
1925-01-01	273.500
1925-04-01	303.800
1925-07-01	345.800
1925-10-01	323.800
1926-01-01	280.000
1926-04-01	323.500
1926-07-01	371.500
1926-10-01	360.600
1927-01-01	299.900
1927-04-01	319.000
1927-07-01	351.000
1927-10-01	312.500
1928-01-01	274.300
1928-04-01	308.400
1928-07-01	353.000
1928-10-01	346.500
1929-01-01	287.200
1929-04-01	334.900
1929-07-01	381.200
1929-10-01	335.800
1930-01-01	266.300
1930-04-01	297.500
1930-07-01	318.100
1930-10-01	271.200
1931-01-01	214.000
1931-04-01	229.500
1931-07-01	242.900
1931-10-01	207.800
1932-01-01	161.700
1932-04-01	145.100
1932-07-01	158.700
1932-10-01	180.700
1933-01-01	138.900
1933-04-01	158.300
1933-07-01	211.500
1933-10-01	190.200
1934-01-01	186.800
1934-04-01	192.900
1934-07-01	196.000
1934-10-01	189.700
1935-01-01	181.100
1935-04-01	189.000
1935-07-01	203.000
1935-10-01	216.500
1936-01-01	202.900
1936-04-01	225.000
1936-07-01	260.800
1936-10-01	270.200
1937-01-01	233.800
1937-04-01	263.200
1937-07-01	281.600
1937-10-01	237.100
1938-01-01	170.400
1938-04-01	171.100
1938-07-01	206.900
1938-10-01	224.100
1939-01-01	188.100
1939-04-01	191.600
1939-07-01	250.900
1939-10-01	271.100
1940-01-01	213.300
1940-04-01	238.800
1940-07-01	283.600
1940-10-01	273.600
1941-01-01	250.500
1941-04-01	292.600
1941-07-01	353.200
1941-10-01	331.400
1942-01-01	291.000
1942-04-01	362.900
1942-07-01	395.500
1942-10-01	371.900
1943-01-01	331.200