Year	Millions Of Long-Tons
1911	43.8800
1912	55.1500
1913	61.9800
1914	41.4400
1915	55.5300
1916	75.1700
1917	75.2900
1918	69.6600
1919	60.9600
1920	67.6000
1921	29.4900
1922	47.1300
1923	69.3500
1924	54.2700
1925	61.9100
1926	67.6200
1927	61.7400
1928	62.2000
1929	73.0300
1930	58.4100
1931	31.1300
1932	9.85000
1933	17.5500
1934	24.5900
1935	30.5400
1936	48.7900
1937	72.0900
1938	28.4500
1939	51.7200