Year	Tonnes
1830	0.03196
1831	0.03835
1832	0.02557
1833	0.03196
1850	0.19814
1855	0.60082
1858	0.8437
1859	0.89484
1860	1.18246
1861	1.50205
1862	1.35504
1863	1.41896
1864	1.59153
1865	1.52122
1866	4.80655
1867	5.51603
1868	4.58923
1869	6.22551
1870	6.75602
1871	9.12094
1872	9.36383
1873	8.78857
1874	10.66773
1875	12.27844
1876	15.24418
1877	15.55737
1878	20.33197
1879	20.86248
1880	24.47378
1881	25.77769
1882	27.1519
1883	30.90382
1884	31.37681
1885	34.17637
1886	35.05203
1887	37.09098
1888	38.6889
1889	41.78248
1890	47.31768
1891	52.09867
1892	55.1475
1893	64.63916
1894	65.83441
1895	75.64565
1896	77.00708
1897	89.03625
1898	99.85738
1899	115.84299
1900	131.22779
1901	134.72405
1902	130.12203
1903	127.28412
1904	141.61429
1905	126.40846
1906	144.18375
1907	161.49884
1908	162.48955
1909	171.5274
1910	168.2165
1911	174.40366
1912	197.56075
1913	214.61378
1914	193.69378
1915	177.78487
1916	189.48805
1917	174.39088
1918	69.54798
1919	59.40437
1920	54.16958
1921	58.74603
1922	71.64446
1923	79.14191
1924	94.29021
1925	93.06301
1926	134.8391
1927	167.64125
1928	186.24107
1929	200.57124
1930	272.6759
1931	327.58052
1932	369.07537
1933	412.46856
1934	498.92895
1935	564.75697
1936	647.59967
1937	662.19829
1938	698.91855
1939	707.48981
1940	848.19008
1941	745.16882
1942	512.83088
1943	654.65609
1944	613.1165
1945	649.12089
1946	729.50918
1947	878.45474
1948	934.77831
1949	1062.61851
1950	1184.48248
1951	1283.73264
1952	1374.69918
1953	1454.37799
1954	1588.4373
1955	1801.15915
1956	1974.8022
1957	2161.06244
1958	2306.69071
1959	2425.20543
1960	2525.01807
1961	2603.96823
1962	2732.9845
1963	2930.94793
1964	3117.06756
1965	3306.61952
1966	3491.97215
1967	3651.37451
1968	3753.96114
1969	3909.50932
1970	4112.05559
1971	4364.45066
1972	4592.80657
1973	4787.67004
1974	4970.93258
1975	5226.14638
1976	5427.75947
1977	5612.81168
1978	5805.8663
1979	5854.18108
1980	6084.94667
1981	5969.98573
1982	6082.86298
1983	6170.06481
1984	6225.59581
1985	6714.13188
1986	6732.46964
1987	7016.10089
1988	7208.91262
1989	7057.91533
1990	6617.45756
1991	6378.29969
1992	5826.863
1993	2555.899
1994	2706.246
1995	3410.31
1996	2563.233
1997	3234.294
1998	3362.639
1999	3014.274
2000	3465.315
2001	3542.322
2002	3043.61
2003	3428.645
2004	3644.998
2005	4352.729
2006	4382.065
2007	5064.127
2008	5559.172
2009	4360.063
2010	4217.05
2011	4917.447
2012	5694.851
2013	5496.833
2014	5529.836