Year	Tonnes
1879	0
1880	0
1881	3.667
1882	3.667
1883	7.334
1884	11.001
1885	7.334
1886	7.334
1887	11.001
1888	18.335
1889	25.669
1890	33.003
1891	40.337
1892	47.671
1893	62.339
1894	80.674
1895	84.341
1896	106.343
1897	110.01
1898	146.68
1899	146.68
1900	216.353
1901	271.358
1902	238.355
1903	234.688
1904	300.694
1905	359.366
1906	315.362
1907	454.708
1908	597.721
1909	605.055
1910	634.391
1911	898.415
1912	898.415
1913	788.405
1914	1184.441
1915	762.736
1916	924.084
1917	1140.437
1918	1422.796
1919	836.076
1920	1100.1
1921	1367.791
1922	1510.804
1923	1606.146
1924	1844.501
1925	1811.498
1926	1782.162
1927	1818.832
1928	2141.528
1929	2486.226
1930	2405.552
1931	2277.207
1932	2640.24
1933	2350.547
1934	2442.222
1935	2475.225
1936	2515.562
1937	2790.587
1938	3175.622
1939	3487.317
1940	4103.373
1941	4426.069
1942	5353.82
1943	5815.862
1944	4393.066
1945	5214.474
1946	4979.786
1947	5914.871
1948	6226.566
1949	7458.678
1950	7506.349
1951	8173.743
1952	9438.858
1953	10597.63
1954	11404.37
1955	12104.767
1956	12981.18
1957	14403.976
1958	15643.422
1959	19644.119
1960	22295.36
1961	25973.361
1962	30736.794
1963	34411.128
1964	42863.563
1965	46317.877
1966	48767.433
1967	55166.348
1968	59526.411
1969	66376.367
1970	61238.9
1971	64300.845
1972	66171.015
1973	68825.923
1974	71260.811
1975	73061.308
1976	73116.313
1977	75969.239
1978	81411.067
1979	79152.195
1980	77487.377
1981	80343.97
1982	90131.193
1983	90365.881
1984	87366.275
1985	89540.806
1986	91528.32
1987	91634.663
1988	87289.268
1989	86739.218
1990	74480.437
1991	57549.898
1992	54205.594
1993	67861.502
1994	54161.59
1995	58004.606
1996	56559.808
1997	51616.692
1998	48998.454
1999	43981.998
2000	43530.957
2001	46453.556
2002	44634.724
2003	47307.967
2004	46801.921
2005	47916.689
2006	48991.12
2007	52254.75
2008	50740.279
2009	42665.545
2010	44114.01
2011	49346.819
2012	44708.064
2013	39599.933
2014	42416.189