Year	Tonnes
1830	0.04012
1831	0.04815
1832	0.0321
1833	0.04012
1850	0.24877
1855	0.75433
1858	1.05927
1859	1.12347
1860	1.48459
1861	1.88583
1862	1.70126
1863	1.78151
1864	1.99818
1865	1.9099
1866	6.03466
1867	6.92541
1868	5.76181
1869	7.81616
1870	8.48222
1871	11.4514
1872	11.75635
1873	11.03411
1874	13.39341
1875	15.41566
1876	19.13917
1877	19.53239
1878	25.52692
1879	26.19298
1880	30.727
1881	32.36406
1882	34.08939
1883	38.79995
1884	39.39379
1885	42.90866
1886	44.00805
1887	46.56797
1888	48.57417
1889	52.45818
1890	59.40766
1891	65.41022
1892	69.23806
1893	81.1549
1894	82.65554
1895	94.97362
1896	96.6829
1897	111.78559
1898	125.3716
1899	145.44165
1900	164.75736
1901	169.14693
1902	163.36907
1903	159.80605
1904	177.79768
1905	158.70666
1906	181.02365
1907	202.76286
1908	204.0067
1909	215.35378
1910	211.19693
1911	218.96495
1912	248.03883
1913	269.44902
1914	243.18382
1915	223.21007
1916	237.9035
1917	218.9489
1918	87.31795
1919	74.58258
1920	68.01026
1921	73.75602
1922	89.95009
1923	99.36319
1924	118.38199
1925	116.84122
1926	169.29138
1927	210.4747
1928	233.8269
1929	251.81852
1930	342.34639
1931	411.27951
1932	463.37657
1933	517.857
1934	626.4086
1935	709.05611
1936	813.06566
1937	831.39433
1938	877.49686
1939	888.25813
1940	1064.90825
1941	935.56438
1942	643.86256
1943	821.92505
1944	769.77181
1945	814.97557
1946	915.90359
1947	1102.90573
1948	1173.62035
1949	1334.12456
1950	1487.12558
1951	1611.73482
1952	1725.9439
1953	1825.98118
1954	1994.29353
1955	2261.36721
1956	2479.37721
1957	2713.22818
1958	2896.06543
1959	3044.86145
1960	3170.17687
1961	3269.29932
1962	3431.28009
1963	3679.82449
1964	3913.49891
1965	4151.48266
1966	4384.19411
1967	4584.32483
1968	4713.12302
1969	4908.41478
1970	5162.71297
1971	5479.59664
1972	5766.299
1973	6010.95137
1974	6241.0387
1975	6561.46132
1976	6814.58788
1977	7046.92216
1978	7289.3035
1979	7349.96304
1980	7639.69075
1981	7495.35653
1982	7637.07467
1983	7746.55714
1984	7816.27668
1985	8429.63694
1986	8452.66012
1987	8808.76103
1988	9050.83743
1989	8861.25934
1990	8308.2617
1991	8007.9974
1992	7315.665
1993	5177.804
1994	2357.881
1995	2449.556
1996	2827.257
1997	2152.529
1998	2497.227
1999	2519.229
2000	2236.87
2001	2291.875
2002	1881.171
2003	2075.522
2004	2563.233
2005	2442.222
2006	2658.575
2007	3234.294
2008	2904.264
2009	2453.223
2010	2544.898
2011	2350.547
2012	2933.6
2013	3479.983
2014	5188.805