Year	Kilotonnes
1850	0.00194
1851	0.00194
1852	0.00389
1853	0.00583
1854	0.00778
1855	0.00972
1856	0.01167
1857	0.01362
1858	0.01558
1859	0.01753
1860	0.01949
1861	0.03873
1862	0.05798
1863	0.07723
1864	0.09649
1865	0.1157
1866	0.135
1867	0.1543
1868	0.1735
1869	0.1928
1870	0.212
1871	0.2313
1872	0.2513
1873	0.2714
1874	0.2915
1875	0.3115
1876	0.3316
1877	0.3516
1878	0.3717
1879	0.3918
1880	0.4118
1881	0.4664
1882	0.4348
1883	0.4376
1884	0.4405
1885	0.4847
1886	0.5289
1887	0.5731
1888	0.6192
1889	0.6883
1890	0.7277
1891	0.613
1892	0.7909
1893	0.6909
1894	0.8588
1895	0.7582
1896	0.8527
1897	0.9609
1898	0.9936
1899	1.002
1900	1.197
1901	1.304
1902	0.6875
1903	0.7527
1904	0.8939
1905	0.971
1906	0.9492
1907	1.028
1908	1.348
1909	1.235
1910	1.474
1911	1.281
1912	1.468
1913	1.677
1914	1.813
1915	2.073
1916	2.28
1917	1.958
1918	2.102
1919	2.3
1920	2.413
1921	3.311
1922	3.413
1923	4.181
1924	4.412
1925	4.372
1926	4.293
1927	4.694
1928	4.87
1929	5.479
1930	5.965
1931	4.917
1932	4.099
1933	4.947
1934	5.971
1935	6.398
1936	6.636
1937	8.455
1938	8.125
1939	8.655
1940	8.047
1941	8.298
1942	8.459
1943	8.485
1944	8.243
1945	8.174
1946	7.919
1947	8.368
1948	9.737
1949	10.08
1950	10.54
1951	10.49
1952	11.55
1953	12.09
1954	12.42
1955	13.11
1956	14.46
1957	14.8
1958	15.12
1959	15.75
1960	14.61
1961	15.33
1962	15.94
1963	15.43
1964	17.57
1965	19.16
1966	19.06
1967	18.54
1968	19.97
1969	19.46
1970	20.48
1971	21.23
1972	21.6
1973	23.41
1974	24.91
1975	22.54
1976	22.1
1977	23.77
1978	23.65
1979	24.65
1980	25.69
1981	26.23
1982	25.6
1983	25.24
1984	25.45
1985	25.55
1986	25.55
1987	26.15
1988	26.03
1989	26.15
1990	25.39
1991	25.6
1992	25.81
1993	26.02
1994	26.24
1995	26.45
1996	26.67
1997	26.89
1998	27.11
1999	27.33
2000	27.56