Year	Thousands Of Net Tons
1914	42678.0
1915	44454.0
1916	49266.0
1917	53914.0
1918	57083.0
1919	59174.0
1920	60220.0
1921	61928.0
1922	63135.0
1923	63383.0
1924	64137.0
1925	65962.0
1926	62925.0
1927	65344.0
1928	66960.0
1929	69584.0
1930	71042.0
1931	75328.0
1932	76898.0
1933	76767.0
1934	78128.0
1935	78452.0
1936	78164.0
1937	78148.0
1938	80186.0
1939	81829.0
1940	81619.0
1941	84152.0
1942	88570.0
1943	90293.0
1944	93652.0
1945	95505.0
1946	91891.0
1947	91241.0
1948	94233.0
1949	96121.0
1950	99393.0
1951	104230.
1952	108588.
1953	117547.
1954	124330.
1955	125828.
1956	128363.
1957	133459.
1958	140743.
1959	147634.
1960	148571.