Year	Kilotonnes
1850	0.00035
1851	0.00039
1852	0.00079
1853	0.00118
1854	0.00156
1855	0.00195
1856	0.00237
1857	0.00279
1858	0.00316
1859	0.00356
1860	0.00395
1861	0.00466
1862	0.00471
1863	0.00498
1864	0.00543
1865	0.00551
1866	0.00616
1867	0.007
1868	0.00579
1869	0.00798
1870	0.00879
1871	0.01186
1872	0.01232
1873	0.0116
1874	0.01368
1875	0.01628
1876	0.01987
1877	0.01983
1878	0.02633
1879	0.02707
1880	0.03158
1881	0.03315
1882	0.03523
1883	0.03989
1884	0.03906
1885	0.04186
1886	0.04361
1887	0.04299
1888	0.04934
1889	0.05795
1890	0.05631
1891	0.05982
1892	0.06416
1893	0.07275
1894	0.07994
1895	0.08759
1896	0.09045
1897	0.1042
1898	0.1169
1899	0.1376
1900	0.1561
1901	0.1579
1902	0.1545
1903	0.1621
1904	0.1774
1905	0.1621
1906	0.1847
1907	0.2124
1908	0.2161
1909	0.2242
1910	0.218
1911	0.2379
1912	0.2593
1913	0.3002
1914	0.2505
1915	0.2241
1916	0.2463
1917	0.222
1918	0.09024
1919	0.06906
1920	0.06299
1921	0.06902
1922	0.08551
1923	0.09527
1924	0.1194
1925	0.1221
1926	0.1842
1927	0.2331
1928	0.2594
1929	0.2969
1930	0.3621
1931	0.4305
1932	0.4737
1933	0.5469
1934	0.6692
1935	0.7754
1936	0.9028
1937	0.9284
1938	0.9855
1939	1.079
1940	1.214
1941	1.197
1942	1.18
1943	1.163
1944	1.145
1945	1.128
1946	1.238
1947	1.374
1948	1.548
1949	1.722
1950	1.894
1951	2.039
1952	2.172
1953	2.291
1954	2.489
1955	2.786
1956	3.033
1957	3.23
1958	3.362
1959	3.423
1960	3.47
1961	3.442
1962	3.528
1963	3.588
1964	3.713
1965	3.885
1966	3.963
1967	4.061
1968	4.083
1969	4.171
1970	4.297
1971	4.394
1972	4.509
1973	4.631
1974	4.798
1975	4.942
1976	4.964
1977	5.086
1978	5.135
1979	5.105
1980	5.141
1981	4.794
1982	4.919
1983	4.754
1984	4.884
1985	6.012
1986	6.101
1987	5.864
1988	6.715
1989	6.031
1990	5.687
1991	5.736
1992	4.076
1993	3.536
1994	2.812
1995	2.651
1996	3.159
1997	2.311
1998	2.207
1999	2.253
2000	2.163