Year	Tonnes
1830	0.11502
1831	0.13803
1832	0.09202
1833	0.11502
1850	0.71314
1855	2.16242
1858	3.03659
1859	3.22062
1860	4.25582
1861	5.40605
1862	4.87694
1863	5.10699
1864	5.72811
1865	5.47506
1866	17.29935
1867	19.85284
1868	16.5172
1869	22.40634
1870	24.31571
1871	32.82736
1872	33.70152
1873	31.63112
1874	38.39443
1875	44.19156
1876	54.86562
1877	55.99284
1878	73.17717
1879	75.08654
1880	88.08405
1881	92.77696
1882	97.72292
1883	111.22653
1884	112.92886
1885	123.00481
1886	126.15642
1887	133.49484
1888	139.24596
1889	150.38011
1890	170.30197
1891	187.5093
1892	198.48243
1893	232.64404
1894	236.94587
1895	272.25771
1896	277.15766
1897	320.45204
1898	359.39858
1899	416.93272
1900	472.30444
1901	484.88787
1902	468.32467
1903	458.11069
1904	509.68667
1905	454.95908
1906	518.93446
1907	581.25353
1908	584.81922
1909	617.34752
1910	605.43121
1911	627.69952
1912	711.04465
1913	772.42054
1914	697.12696
1915	639.86888
1916	681.99003
1917	627.65351
1918	250.31146
1919	213.80339
1920	194.96274
1921	211.43393
1922	257.85692
1923	284.84114
1924	339.3617
1925	334.94484
1926	485.30195
1927	603.36081
1928	670.30377
1929	721.87975
1930	981.39299
1931	1179.00125
1932	1328.34616
1933	1484.5234
1934	1795.70464
1935	2032.62751
1936	2330.78823
1937	2383.3304
1938	2515.49099
1939	2546.33996
1940	3052.737
1941	2681.95121
1942	1845.73933
1943	2356.18515
1944	2206.6792
1945	2336.26329
1946	2625.5903
1947	3161.66308
1948	3364.37833
1949	3824.4904
1950	4263.09332
1951	4620.30647
1952	4947.70585
1953	5234.47937
1954	5716.97478
1955	6482.586
1956	7107.54799
1957	7777.92077
1958	8302.05424
1959	8728.60282
1960	9087.84036
1961	9371.99137
1962	9836.33627
1963	10548.8302
1964	11218.69689
1965	11900.91696
1966	12568.02311
1967	13141.73118
1968	13510.95266
1969	14070.78904
1970	14799.77717
1971	15708.17703
1972	16530.05714
1973	17231.39392
1974	17890.97761
1975	18809.52244
1976	19535.15192
1977	20201.17685
1978	20896.00337
1979	21069.89403
1980	21900.44683
1981	21486.68872
1982	21892.94737
1983	22206.79713
1984	22406.65983
1985	24164.95922
1986	24230.959
1987	25251.78163
1988	25945.73397
1989	25402.27676
1990	23817.01686
1991	22956.25923
1992	20971.573
1993	15628.754
1994	12090.099
1995	11191.684
1996	11521.714
1997	7099.312
1998	6270.57
1999	4503.076
2000	3512.986
2001	3714.671
2002	3986.029
2003	4290.39
2004	4554.414
2005	4895.445
2006	4994.454
2007	4679.092
2008	4778.101
2009	4550.747
2010	4932.115
2011	5038.458
2012	4924.781
2013	4998.121
2014	4932.115