Year	Kilotonnes
1850	0.1035
1851	0.1312
1852	0.1457
1853	0.1674
1854	0.1984
1855	0.2163
1856	0.2304
1857	0.2401
1858	0.2525
1859	0.2758
1860	0.2911
1861	0.2837
1862	0.298
1863	0.3396
1864	0.3615
1865	0.3741
1866	0.4291
1867	0.4442
1868	0.4978
1869	0.5536
1870	0.5893
1871	0.6165
1872	0.7405
1873	0.8092
1874	0.7865
1875	0.8027
1876	0.7915
1877	0.8661
1878	0.8485
1879	1.011
1880	1.137
1881	1.205
1882	1.35
1883	1.477
1884	1.569
1885	1.591
1886	1.644
1887	1.873
1888	2.147
1889	2.041
1890	2.275
1891	2.442
1892	2.594
1893	2.628
1894	2.484
1895	2.772
1896	2.81
1897	2.934
1898	3.199
1899	3.653
1900	3.875
1901	4.218
1902	4.391
1903	5.147
1904	5.151
1905	5.744
1906	6.041
1907	6.855
1908	6.176
1909	6.806
1910	7.364
1911	7.379
1912	7.98
1913	8.563
1914	7.731
1915	8.107
1916	9.261
1917	10.08
1918	10.55
1919	8.548
1920	9.875
1921	7.762
1922	7.723
1923	10.38
1924	9.24
1925	9.39
1926	10.09
1927	10.04
1928	9.7
1929	10.38
1930	9.205
1931	7.593
1932	6.211
1933	6.625
1934	7.297
1935	7.545
1936	8.746
1937	9.244
1938	7.657
1939	8.63
1940	9.719
1941	11.05
1942	11.78
1943	12.73
1944	12.8
1945	12.17
1946	11.05
1947	12.44
1948	11.76
1949	10.19
1950	10.88
1951	10.71
1952	10.37
1953	10.33
1954	10.08
1955	10.46
1956	10.76
1957	10.72
1958	10.93
1959	11.07
1960	10.98
1961	10.9
1962	11.21
1963	11.7
1964	12.27
1965	12.97
1966	13.73
1967	13.88
1968	14.64
1969	14.74
1970	15.1
1971	64.95
1972	59.23
1973	79.75
1974	68.68
1975	48.73
1976	50.29
1977	86.13
1978	53.08
1979	50.7
1980	68.55
1981	50.78
1982	48.65
1983	34
1984	26.15
1985	4.475
1986	3.533
1987	2.795
1988	2.248
1989	1.784
1990	1.404
1991	1.366
1992	1.311
1993	1.298
1994	1.258
1995	1.237
1996	1.253
1997	1.249
1998	1.252
1999	1.252
2000	1.262