Year	Tonnes
1830	0.12148
1831	0.14577
1832	0.09718
1833	0.12148
1850	0.75317
1855	2.28379
1858	3.20703
1859	3.40139
1860	4.4947
1861	5.70948
1862	5.15068
1863	5.39364
1864	6.04962
1865	5.78237
1866	18.27034
1867	20.96716
1868	17.44429
1869	23.66398
1870	25.68052
1871	34.66991
1872	35.59315
1873	33.40654
1874	40.54946
1875	46.67197
1876	57.94516
1877	59.13564
1878	77.28451
1879	79.30105
1880	93.0281
1881	97.98441
1882	103.20798
1883	117.46953
1884	119.26741
1885	129.90891
1886	133.23742
1887	140.98774
1888	147.06165
1889	158.82075
1890	179.8608
1891	198.03395
1892	209.62298
1893	245.70204
1894	250.24533
1895	287.53918
1896	292.71415
1897	338.43859
1898	379.57115
1899	440.33461
1900	498.81427
1901	512.10399
1902	494.61112
1903	483.82384
1904	538.29472
1905	480.49534
1906	548.06158
1907	613.87853
1908	617.64436
1909	651.99843
1910	639.41327
1911	662.93147
1912	750.95466
1913	815.77549
1914	736.25579
1915	675.78388
1916	720.26924
1917	662.88288
1918	264.36111
1919	225.8039
1920	205.90575
1921	223.30144
1922	272.33009
1923	300.82891
1924	358.40963
1925	353.74486
1926	512.54132
1927	637.22666
1928	707.92704
1929	762.39792
1930	1036.4773
1931	1245.17705
1932	1402.9045
1933	1567.84776
1934	1896.4952
1935	2146.71623
1936	2461.61233
1937	2517.10362
1938	2656.68221
1939	2689.2627
1940	3224.08314
1941	2832.48563
1942	1949.33826
1943	2488.43474
1944	2330.53722
1945	2467.3947
1946	2772.96126
1947	3339.1231
1948	3553.21649
1949	4039.15405
1950	4502.37517
1951	4879.63824
1952	5225.41412
1953	5528.28386
1954	6037.86111
1955	6846.44508
1956	7506.48537
1957	8214.4853
1958	8768.0377
1959	9218.52789
1960	9597.92897
1961	9898.02901
1962	10388.43698
1963	11140.92227
1964	11848.38769
1965	12568.89989
1966	13273.44983
1967	13879.35938
1968	14269.30478
1969	14860.56405
1970	15630.46933
1971	16589.85649
1972	17457.86766
1973	18198.56955
1974	18895.17482
1975	19865.27636
1976	20631.63448
1977	21335.04253
1978	22068.86875
1979	22252.51967
1980	23129.6903
1981	22692.7085
1982	23121.76991
1983	23453.23565
1984	23664.31638
1985	25521.30682
1986	25591.01108
1987	26669.13115
1988	27402.03413
1989	26828.07338
1990	25153.83491
1991	24244.76407
1992	22148.68
1993	17495.257
1994	17359.578
1995	16204.473
1996	15731.43
1997	15339.061
1998	16197.139
1999	13692.578
2000	12163.439
2001	12885.838
2002	13142.528
2003	12823.499
2004	13245.204
2005	13901.597
2006	14158.287
2007	15166.712
2008	15009.031
2009	12519.138
2010	13468.891
2011	13787.92
2012	13831.924
2013	12640.149
2014	12838.167