Year	Kilotonnes
1850	0.00096
1851	0.00096
1852	0.00192
1853	0.00288
1854	0.00384
1855	0.00481
1856	0.00577
1857	0.00673
1858	0.0077
1859	0.00867
1860	0.00963
1861	0.01914
1862	0.02866
1863	0.03817
1864	0.04769
1865	0.05721
1866	0.06672
1867	0.07624
1868	0.08576
1869	0.09528
1870	0.1048
1871	0.1143
1872	0.1242
1873	0.1341
1874	0.1441
1875	0.154
1876	0.1639
1877	0.1738
1878	0.1837
1879	0.1936
1880	0.2036
1881	0.2305
1882	0.2149
1883	0.2163
1884	0.2177
1885	0.2396
1886	0.2614
1887	0.2833
1888	0.3061
1889	0.3402
1890	0.3597
1891	0.303
1892	0.3909
1893	0.3415
1894	0.4245
1895	0.3748
1896	0.4215
1897	0.4749
1898	0.4911
1899	0.4954
1900	0.5919
1901	0.6447
1902	0.3398
1903	0.3721
1904	0.4419
1905	0.4799
1906	0.4692
1907	0.5081
1908	0.6663
1909	0.6107
1910	0.7286
1911	0.6332
1912	0.7254
1913	0.829
1914	0.8961
1915	1.025
1916	1.127
1917	0.9678
1918	1.039
1919	1.137
1920	1.193
1921	1.636
1922	1.687
1923	2.067
1924	2.181
1925	2.161
1926	2.122
1927	2.32
1928	2.407
1929	2.708
1930	2.948
1931	2.43
1932	2.026
1933	2.445
1934	2.951
1935	3.163
1936	3.28
1937	4.179
1938	4.016
1939	4.278
1940	3.977
1941	4.101
1942	4.181
1943	4.194
1944	4.074
1945	4.04
1946	3.914
1947	4.136
1948	4.813
1949	4.982
1950	5.207
1951	5.187
1952	5.711
1953	5.975
1954	6.138
1955	6.481
1956	7.149
1957	7.313
1958	7.472
1959	7.784
1960	7.221
1961	7.576
1962	7.88
1963	7.627
1964	8.682
1965	9.468
1966	9.422
1967	9.162
1968	9.872
1969	9.619
1970	10.12
1971	10.49
1972	10.67
1973	11.57
1974	12.31
1975	11.14
1976	10.92
1977	11.75
1978	11.69
1979	12.19
1980	12.7
1981	12.97
1982	12.65
1983	12.47
1984	12.58
1985	12.63
1986	12.63
1987	12.92
1988	12.87
1989	12.92
1990	12.55
1991	12.7
1992	12.86
1993	13.02
1994	13.18
1995	13.34
1996	13.5
1997	13.66
1998	13.83
1999	14
2000	14.17