Quarter	Thousand Gross Tons
1918-04-01	2704.90
1918-07-01	3382.70
1918-10-01	3645.90
1919-01-01	4185.50
1919-04-01	3874.10
1919-07-01	3470.70
1919-10-01	2966.50
1920-01-01	2573.30
1920-04-01	2106.00
1920-07-01	1772.20
1920-10-01	1310.30
1921-01-01	1102.70
1921-04-01	717.600
1921-07-01	434.000
1921-10-01	216.400
1922-01-01	136.300
1922-04-01	150.600
1922-07-01	147.100
1922-10-01	139.400
1923-01-01	173.800
1923-04-01	133.700
1923-07-01	99.4000
1923-10-01	91.6000
1924-01-01	119.800
1924-04-01	103.700
1924-07-01	64.9000
1924-10-01	58.2000
1925-01-01	81.7000
1925-04-01	92.0000
1925-07-01	69.9000
1925-10-01	105.200
1926-01-01	117.800
1926-04-01	133.300
1926-07-01	119.700
1926-10-01	151.600
1927-01-01	179.300
1927-04-01	146.800
1927-07-01	91.1000
1927-10-01	97.4000
1928-01-01	56.0000
1928-04-01	55.5000
1928-07-01	64.6000
1928-10-01	47.9000
1929-01-01	96.4000
1929-04-01	119.100
1929-07-01	112.000
1929-10-01	179.100
1930-01-01	223.000
1930-04-01	238.200
1930-07-01	213.000
1930-10-01	232.000
1931-01-01	231.000
1931-04-01	301.500
1931-07-01	261.400
1931-10-01	207.800
1932-01-01	206.700
1932-04-01	162.200
1932-07-01	124.700
1932-10-01	59.6000
1933-01-01	31.1000
1933-04-01	3.00000
1933-07-01	14.7000
1933-10-01	12.4000
1934-01-01	27.3000
1934-04-01	27.6000
1934-07-01	22.2000
1934-10-01	20.1000
1935-01-01	18.5000
1935-04-01	25.9000
1935-07-01	16.8000
1935-10-01	33.4000
1936-01-01	49.8000
1936-04-01	90.3000
1936-07-01	91.0000
1936-10-01	110.400
1937-01-01	153.400
1937-04-01	198.700
1937-07-01	216.000
1937-10-01	204.100
1938-01-01	172.800
1938-04-01	166.900
1938-07-01	250.900
1938-10-01	298.600
1939-01-01	420.900
1939-04-01	391.800