Year	Tonnes
1911	11.001
1912	84.341
1913	40.337
1914	308.028
1915	91.675
1916	179.683
1917	421.705
1918	865.412
1919	689.396
1920	454.708
1921	561.051
1922	531.715
1923	469.376
1924	498.712
1925	553.717
1926	531.715
1927	568.385
1928	869.079
1929	924.084
1930	1023.093
1931	1008.425
1932	953.42
1933	872.746
1934	825.075
1935	748.068
1936	729.733
1937	689.396
1938	880.08
1939	2229.536
1940	3032.609
1941	3956.693
1942	3839.349
1943	4107.04
1944	4363.73
1945	4360.063
1946	4228.051
1947	4418.735
1948	6156.893
1949	7469.679
1950	10245.598
1951	10571.961
1952	10905.658
1953	10791.981
1954	11679.395
1955	10656.302
1956	9955.905
1957	11932.418
1958	13699.912
1959	12724.49
1960	16054.126
1961	17088.22
1962	18595.357
1963	21554.626
1964	25522.32
1965	27641.846
1966	26563.748
1967	19677.122
1968	22904.082
1969	19695.457
1970	21686.638
1971	23047.095
1972	25511.319
1973	23795.163
1974	26123.708
1975	31099.827
1976	34495.469
1977	37865.442
1978	39313.907
1979	42947.904
1980	45239.779
1981	50978.634
1982	56523.138
1983	57091.523
1984	63838.803
1985	63937.812
1986	74564.778
1987	74810.467
1988	74531.775
1989	72181.228
1990	75943.57
1991	78715.822
1992	81264.387
1993	93156.468
1994	85312.755
1995	95723.368
1996	102030.608
1997	108202.169
1998	122243.112
1999	125393.065
2000	141326.18
2001	125451.737
2002	127193.562
2003	147963.45
2004	150911.718
2005	167207.866
2006	178586.567
2007	189092.522
2008	198586.385
2009	206734.459
2010	202715.427
2011	217163.407
2012	217068.065
2013	213412.066
2014	201894.019