Year	Tonnes
1830	0.06152
1831	0.07383
1832	0.04922
1833	0.06152
1850	0.38145
1855	1.15664
1858	1.62422
1859	1.72266
1860	2.27637
1861	2.89161
1862	2.6086
1863	2.73165
1864	3.06387
1865	2.92852
1866	9.25314
1867	10.61896
1868	8.83478
1869	11.98479
1870	13.00608
1871	17.55882
1872	18.0264
1873	16.91897
1874	20.53656
1875	23.63734
1876	29.34673
1877	29.94966
1878	39.14128
1879	40.16257
1880	47.11473
1881	49.62489
1882	52.2704
1883	59.49326
1884	60.40381
1885	65.79327
1886	67.47902
1887	71.40422
1888	74.4804
1889	80.43587
1890	91.09175
1891	100.29567
1892	106.16502
1893	124.43751
1894	126.73849
1895	145.62622
1896	148.24712
1897	171.40458
1898	192.23645
1899	223.01052
1900	252.62795
1901	259.35863
1902	250.49924
1903	245.03595
1904	272.6231
1905	243.3502
1906	277.5696
1907	310.90305
1908	312.81028
1909	330.20914
1910	323.8353
1911	335.74625
1912	380.32621
1913	413.15517
1914	372.88186
1915	342.25545
1916	364.78536
1917	335.72165
1918	133.88752
1919	114.35995
1920	104.2824
1921	113.09257
1922	137.92347
1923	152.35689
1924	181.51905
1925	179.15654
1926	259.58011
1927	322.72787
1928	358.53457
1929	386.12173
1930	524.93114
1931	630.62858
1932	710.51074
1933	794.0474
1934	960.49318
1935	1087.21936
1936	1246.70068
1937	1274.80463
1938	1345.49518
1939	1361.99579
1940	1632.85932
1941	1434.53204
1942	987.25592
1943	1260.28508
1944	1180.31678
1945	1249.6292
1946	1404.38551
1947	1691.12211
1948	1799.5512
1949	2045.65766
1950	2280.25922
1951	2471.32672
1952	2646.44732
1953	2799.8378
1954	3057.91674
1955	3467.42972
1956	3801.71171
1957	4160.2832
1958	4440.63366
1959	4668.78755
1960	4860.93787
1961	5012.92562
1962	5261.29614
1963	5642.39755
1964	6000.69834
1965	6365.60675
1966	6722.43097
1967	7029.29807
1968	7226.78863
1969	7526.236
1970	7916.15988
1971	8402.04818
1972	8841.65847
1973	9216.7921
1974	9569.59268
1975	10060.90735
1976	10449.03475
1977	10805.28064
1978	11176.93204
1979	11269.94332
1980	11714.19249
1981	11492.88002
1982	11710.18115
1983	11878.05428
1984	11984.95758
1985	12925.44331
1986	12960.74551
1987	13506.76692
1988	13877.95073
1989	13587.26432
1990	12739.3346
1991	12278.92935
1992	11217.353
1993	8621.117
1994	6226.566
1995	4528.745
1996	5694.851
1997	5610.51
1998	5955.208
1999	4671.758
2000	4635.088
2001	3894.354
2002	4957.784
2003	5438.161
2004	5874.534
2005	5592.175
2006	5507.834
2007	6629.936
2008	7660.363
2009	6791.284
2010	6384.247
2011	7656.696
2012	10131.921
2013	9842.228
2014	9607.54