Year	Kilotonnes
1850	0.00081
1851	0.00081
1852	0.00162
1853	0.00243
1854	0.00324
1855	0.00405
1856	0.00486
1857	0.00568
1858	0.00649
1859	0.0073
1860	0.00812
1861	0.01614
1862	0.02416
1863	0.03218
1864	0.0402
1865	0.04822
1866	0.05624
1867	0.06426
1868	0.07229
1869	0.08031
1870	0.08833
1871	0.09636
1872	0.1047
1873	0.1131
1874	0.1214
1875	0.1298
1876	0.1381
1877	0.1465
1878	0.1549
1879	0.1632
1880	0.1716
1881	0.1943
1882	0.1811
1883	0.1823
1884	0.1835
1885	0.2019
1886	0.2203
1887	0.2387
1888	0.258
1889	0.2868
1890	0.3032
1891	0.2554
1892	0.3295
1893	0.2878
1894	0.3578
1895	0.3159
1896	0.3553
1897	0.4003
1898	0.4139
1899	0.4175
1900	0.4989
1901	0.5434
1902	0.2864
1903	0.3136
1904	0.3724
1905	0.4045
1906	0.3955
1907	0.4283
1908	0.5616
1909	0.5147
1910	0.6142
1911	0.5337
1912	0.6114
1913	0.6988
1914	0.7553
1915	0.8636
1916	0.9498
1917	0.8158
1918	0.8757
1919	0.9581
1920	1.005
1921	1.379
1922	1.422
1923	1.742
1924	1.838
1925	1.821
1926	1.788
1927	1.956
1928	2.029
1929	2.283
1930	2.485
1931	2.048
1932	1.708
1933	2.061
1934	2.487
1935	2.666
1936	2.765
1937	3.522
1938	3.385
1939	3.606
1940	3.352
1941	3.457
1942	3.524
1943	3.535
1944	3.434
1945	3.405
1946	3.299
1947	3.486
1948	4.057
1949	4.199
1950	4.389
1951	5.579
1952	4.201
1953	5.709
1954	2.3
1955	4.1
1956	2.648
1957	3.203
1958	4.353
1959	2.769
1960	0.8583
1961	1.357
1962	0.6847
1963	1.605
1964	6.047
1965	27.26
1966	34.78
1967	37.6
1968	26.96
1969	24.92
1970	32.94
1971	35.84
1972	39.02
1973	42.11
1974	42.02
1975	44.43
1976	53.98
1977	57.81
1978	52.8
1979	48.74
1980	49.91
1981	55.06
1982	59.43
1983	61.6
1984	56.88
1985	50.96
1986	53.75
1987	63.58
1988	64.34
1989	71.94
1990	67.46
1991	69.27
1992	75.47
1993	70.82
1994	65.63
1995	66.21
1996	54.52
1997	54.03
1998	53.71
1999	54.04
2000	55.76