Year	Kilotonnes
1850	0.0014
1851	0.0014
1852	0.00281
1853	0.00421
1854	0.00562
1855	0.00703
1856	0.00843
1857	0.00984
1858	0.01125
1859	0.01267
1860	0.01408
1861	0.02798
1862	0.04189
1863	0.0558
1864	0.06971
1865	0.08362
1866	0.09753
1867	0.1114
1868	0.1254
1869	0.1393
1870	0.1532
1871	0.1671
1872	0.1816
1873	0.1961
1874	0.2106
1875	0.2251
1876	0.2396
1877	0.2541
1878	0.2686
1879	0.2831
1880	0.2976
1881	0.337
1882	0.3141
1883	0.3162
1884	0.3182
1885	0.3502
1886	0.3821
1887	0.414
1888	0.4474
1889	0.4973
1890	0.5258
1891	0.4429
1892	0.5714
1893	0.4991
1894	0.6205
1895	0.5478
1896	0.6161
1897	0.6942
1898	0.7179
1899	0.7241
1900	0.8652
1901	0.9423
1902	0.4967
1903	0.5439
1904	0.6459
1905	0.7015
1906	0.6858
1907	0.7427
1908	0.9739
1909	0.8926
1910	1.065
1911	0.9255
1912	1.06
1913	1.212
1914	1.31
1915	1.498
1916	1.647
1917	1.415
1918	1.519
1919	1.662
1920	1.744
1921	2.392
1922	2.466
1923	3.021
1924	3.188
1925	3.159
1926	3.102
1927	3.392
1928	3.519
1929	3.958
1930	4.31
1931	3.552
1932	2.962
1933	3.574
1934	4.314
1935	4.623
1936	4.795
1937	6.109
1938	5.871
1939	6.253
1940	5.814
1941	5.995
1942	6.111
1943	6.131
1944	5.956
1945	5.905
1946	5.721
1947	6.046
1948	7.035
1949	7.283
1950	7.612
1951	7.582
1952	8.348
1953	8.734
1954	8.973
1955	9.473
1956	10.45
1957	10.69
1958	10.92
1959	11.38
1960	10.56
1961	11.07
1962	11.52
1963	11.15
1964	12.69
1965	13.84
1966	13.77
1967	13.39
1968	14.43
1969	14.06
1970	14.8
1971	15.34
1972	15.6
1973	16.91
1974	18
1975	16.29
1976	15.97
1977	17.18
1978	17.09
1979	17.93
1980	19.06
1981	18.95
1982	18.3
1983	17.16
1984	17.48
1985	17.37
1986	17.53
1987	17.7
1988	18.18
1989	18.48
1990	18.8
1991	19.27
1992	19.68
1993	20.03
1994	20.32
1995	20.56
1996	20.81
1997	21.09
1998	21.39
1999	21.71
2000	22.07