Year	Kilotonnes
1850	0.00039
1851	0.00039
1852	0.00078
1853	0.00116
1854	0.00155
1855	0.00194
1856	0.00233
1857	0.00272
1858	0.00311
1859	0.0035
1860	0.00389
1861	0.00773
1862	0.01157
1863	0.01541
1864	0.01925
1865	0.0231
1866	0.02694
1867	0.03078
1868	0.03462
1869	0.03847
1870	0.04231
1871	0.04615
1872	0.05016
1873	0.05416
1874	0.05816
1875	0.06216
1876	0.06617
1877	0.07017
1878	0.07417
1879	0.07818
1880	0.08218
1881	0.09306
1882	0.08676
1883	0.08732
1884	0.08789
1885	0.09671
1886	0.1055
1887	0.1144
1888	0.1236
1889	0.1374
1890	0.1452
1891	0.1223
1892	0.1578
1893	0.1379
1894	0.1714
1895	0.1513
1896	0.1702
1897	0.1917
1898	0.1983
1899	0.2
1900	0.2389
1901	0.2603
1902	0.1372
1903	0.1502
1904	0.1784
1905	0.1938
1906	0.1894
1907	0.2051
1908	0.269
1909	0.2465
1910	0.2942
1911	0.2556
1912	0.2929
1913	0.3347
1914	0.3618
1915	0.4137
1916	0.4549
1917	0.3907
1918	0.4194
1919	0.4589
1920	0.4815
1921	0.6606
1922	0.681
1923	0.8343
1924	0.8804
1925	0.8724
1926	0.8566
1927	0.9367
1928	0.9719
1929	1.093
1930	1.19
1931	0.9811
1932	0.818
1933	0.9872
1934	1.191
1935	1.277
1936	1.324
1937	1.687
1938	1.621
1939	1.727
1940	1.606
1941	1.656
1942	1.688
1943	1.693
1944	1.645
1945	1.631
1946	1.58
1947	1.67
1948	1.943
1949	2.011
1950	2.102
1951	2.094
1952	2.306
1953	2.412
1954	2.478
1955	2.616
1956	2.886
1957	2.952
1958	3.017
1959	3.143
1960	2.915
1961	3.059
1962	3.181
1963	3.079
1964	3.505
1965	3.822
1966	11.24
1967	12.42
1968	12.78
1969	13.95
1970	13.06
1971	12.02
1972	14.43
1973	14.66
1974	16.93
1975	17.3
1976	17.43
1977	17.7
1978	17.25
1979	19.64
1980	22.18
1981	22.18
1982	21.63
1983	16.97
1984	16.29
1985	18.8
1986	21.93
1987	19.43
1988	24.47
1989	24.16
1990	21.8
1991	22.4
1992	25.61
1993	23.14
1994	22.86
1995	22.94
1996	22.65
1997	23.45
1998	23.41
1999	22.84
2000	24.39