Year	Kilotonnes
1850	0.00144
1851	0.00162
1852	0.00323
1853	0.00482
1854	0.0064
1855	0.008
1856	0.00973
1857	0.01144
1858	0.01296
1859	0.01461
1860	0.01622
1861	0.01913
1862	0.01934
1863	0.02046
1864	0.02229
1865	0.02263
1866	0.02527
1867	0.02871
1868	0.02375
1869	0.03274
1870	0.03606
1871	0.04869
1872	0.05056
1873	0.04762
1874	0.05613
1875	0.0668
1876	0.08155
1877	0.08137
1878	0.1081
1879	0.1111
1880	0.1296
1881	0.1361
1882	0.1446
1883	0.1637
1884	0.1603
1885	0.1718
1886	0.179
1887	0.1764
1888	0.2025
1889	0.2378
1890	0.2311
1891	0.2455
1892	0.2634
1893	0.2986
1894	0.3281
1895	0.3595
1896	0.3712
1897	0.4276
1898	0.4799
1899	0.5646
1900	0.6408
1901	0.648
1902	0.6339
1903	0.6655
1904	0.7281
1905	0.6653
1906	0.7579
1907	0.8719
1908	0.8868
1909	0.9201
1910	0.8947
1911	0.9766
1912	1.064
1913	1.232
1914	1.028
1915	0.9197
1916	1.011
1917	0.9111
1918	0.3704
1919	0.2835
1920	0.2585
1921	0.2833
1922	0.351
1923	0.391
1924	0.49
1925	0.5012
1926	0.7561
1927	0.9567
1928	1.065
1929	1.218
1930	1.486
1931	1.767
1932	1.944
1933	2.245
1934	2.747
1935	3.183
1936	3.706
1937	3.81
1938	4.045
1939	4.43
1940	4.984
1941	4.912
1942	4.843
1943	4.773
1944	4.701
1945	4.629
1946	5.081
1947	5.64
1948	6.352
1949	7.066
1950	7.773
1951	8.368
1952	8.915
1953	9.401
1954	10.21
1955	11.44
1956	12.45
1957	13.26
1958	13.8
1959	14.05
1960	14.24
1961	14.13
1962	14.48
1963	14.73
1964	15.24
1965	15.95
1966	16.26
1967	16.67
1968	16.76
1969	17.12
1970	17.64
1971	18.04
1972	18.51
1973	19.01
1974	19.69
1975	20.29
1976	20.37
1977	20.87
1978	21.08
1979	20.95
1980	21.1
1981	19.68
1982	20.19
1983	19.51
1984	20.04
1985	24.68
1986	26.64
1987	27.45
1988	28.62
1989	28.03
1990	25.01
1991	26.05
1992	20.4
1993	15.8
1994	10.5
1995	7.85
1996	7
1997	4.95
1998	5.4
1999	4.36
2000	4.855