Year	Tonnes
1830	0.08411
1831	0.10093
1832	0.06729
1833	0.08411
1850	0.52148
1855	1.58126
1858	2.22049
1859	2.35507
1860	3.11206
1861	3.95315
1862	3.56625
1863	3.73447
1864	4.18866
1865	4.00362
1866	12.65009
1867	14.51733
1868	12.07815
1869	16.38456
1870	17.78078
1871	24.0049
1872	24.64413
1873	23.13016
1874	28.0758
1875	32.31493
1876	40.12031
1877	40.94458
1878	53.51056
1879	54.90678
1880	64.41117
1881	67.84285
1882	71.45956
1883	81.33404
1884	82.57886
1885	89.94687
1886	92.25147
1887	97.61767
1888	101.82315
1889	109.96496
1890	124.53276
1891	137.11556
1892	145.13962
1893	170.12019
1894	173.26589
1895	199.08756
1896	202.67063
1897	234.3295
1898	262.80903
1899	304.88068
1900	345.37107
1901	354.57267
1902	342.46088
1903	334.99194
1904	372.70671
1905	332.68733
1906	379.46912
1907	425.03974
1908	427.64714
1909	451.43335
1910	442.71959
1911	459.00322
1912	519.94907
1913	564.82999
1914	509.7718
1915	467.90202
1916	498.70297
1917	458.96957
1918	183.03943
1919	156.34303
1920	142.56587
1921	154.61037
1922	188.55703
1923	208.28915
1924	248.15713
1925	244.92732
1926	354.87546
1927	441.20561
1928	490.15743
1929	527.8722
1930	717.64041
1931	862.1408
1932	971.34878
1933	1085.55287
1934	1313.10313
1935	1486.3522
1936	1704.38125
1937	1742.80254
1938	1839.44454
1939	1862.00275
1940	2232.30392
1941	1961.16803
1942	1349.69083
1943	1722.95266
1944	1613.62693
1945	1708.38487
1946	1919.9543
1947	2311.95576
1948	2460.19062
1949	2796.64607
1950	3117.37301
1951	3378.58396
1952	3617.99368
1953	3827.69588
1954	4180.51906
1955	4740.36976
1956	5197.37116
1957	5687.57906
1958	6070.84994
1959	6382.76219
1960	6645.45347
1961	6853.23797
1962	7192.78865
1963	7713.7975
1964	8203.63532
1965	8702.50651
1966	9190.3257
1967	9609.84784
1968	9879.83984
1969	10289.21835
1970	10822.28853
1971	11486.55295
1972	12087.55009
1973	12600.40031
1974	13082.71872
1975	13754.40161
1976	14285.01579
1977	14772.04434
1978	15280.13396
1979	15407.29093
1980	16014.62994
1981	15712.07068
1982	16009.14599
1983	16238.6476
1984	16384.79654
1985	17670.54721
1986	17718.80933
1987	18465.28253
1988	18972.7329
1989	18575.3316
1990	17416.1155
1991	16786.6893
1992	15335.394
1993	9952.238
1994	6083.553
1995	2302.876
1996	4066.703
1997	4437.07
1998	4961.451
1999	4345.395
2000	4536.079
2001	3769.676
2002	3388.308
2003	3773.343
2004	4323.393
2005	5067.794
2006	6149.559
2007	6420.917
2008	5166.803
2009	6241.234
2010	6314.574
2011	7972.058
2012	8441.434
2013	7858.381
2014	8987.817