Year	Kilotonnes
1850	0.00441
1851	0.00495
1852	0.0099
1853	0.01478
1854	0.01962
1855	0.02454
1856	0.02983
1857	0.03507
1858	0.03974
1859	0.0448
1860	0.04973
1861	0.05866
1862	0.0593
1863	0.06271
1864	0.06834
1865	0.06939
1866	0.07746
1867	0.08803
1868	0.07281
1869	0.1004
1870	0.1105
1871	0.1493
1872	0.155
1873	0.146
1874	0.1721
1875	0.2048
1876	0.25
1877	0.2495
1878	0.3314
1879	0.3406
1880	0.3974
1881	0.4172
1882	0.4432
1883	0.5019
1884	0.4915
1885	0.5267
1886	0.5487
1887	0.5409
1888	0.6209
1889	0.7291
1890	0.7085
1891	0.7526
1892	0.8074
1893	0.9154
1894	1.006
1895	1.102
1896	1.138
1897	1.311
1898	1.471
1899	1.731
1900	1.965
1901	1.987
1902	1.943
1903	2.04
1904	2.232
1905	2.04
1906	2.324
1907	2.673
1908	2.719
1909	2.821
1910	2.743
1911	2.994
1912	3.262
1913	3.778
1914	3.151
1915	2.819
1916	3.099
1917	2.793
1918	1.135
1919	0.869
1920	0.7926
1921	0.8685
1922	1.076
1923	1.199
1924	1.502
1925	1.537
1926	2.318
1927	2.933
1928	3.264
1929	3.735
1930	4.556
1931	5.417
1932	5.961
1933	6.882
1934	8.42
1935	9.757
1936	11.36
1937	11.68
1938	12.4
1939	13.58
1940	15.28
1941	15.06
1942	14.85
1943	14.63
1944	14.41
1945	14.19
1946	15.58
1947	17.29
1948	19.47
1949	21.66
1950	23.83
1951	25.65
1952	27.33
1953	28.82
1954	31.31
1955	35.06
1956	38.17
1957	40.64
1958	42.3
1959	43.07
1960	43.67
1961	43.3
1962	44.39
1963	45.14
1964	46.72
1965	48.89
1966	49.86
1967	51.1
1968	51.37
1969	52.48
1970	54.07
1971	55.29
1972	56.73
1973	58.27
1974	60.38
1975	62.19
1976	62.46
1977	63.99
1978	64.61
1979	64.24
1980	64.69
1981	60.32
1982	61.9
1983	59.82
1984	61.45
1985	75.65
1986	81.67
1987	84.16
1988	91.32
1989	86.24
1990	83.07
1991	72.6
1992	83.97
1993	51.68
1994	38.23
1995	32.58
1996	27.24
1997	20.93
1998	20.94
1999	22.91
2000	25.15