Year	Thousands Of Short Tons
1905	3.50000
1906	3.80000
1907	26.4000
1908	19.6000
1909	11.2000
1910	23.2000
1911	9.00000
1912	4.50000
1913	40.7000
1914	20.0000
1915	14.2000
1916	17.5000
1917	53.7000
1918	41.2000
1919	36.8000
1920	71.0000
1921	70.3000
1922	16.8000
1923	27.8000
1924	20.8000
1925	13.1000
1926	26.9000
1927	53.5000
1928	48.4000
1929	85.9000
1930	167.300
1931	143.600
1932	128.200
1933	110.500
1934	124.800
1935	90.5000
1936	55.5000
1937	79.1000
1938	157.500
1939	83.7000
1940	19.2000