Year	Kilotonnes
1850	0.00148
1851	0.00148
1852	0.00297
1853	0.00445
1854	0.00594
1855	0.00743
1856	0.00892
1857	0.01041
1858	0.0119
1859	0.01339
1860	0.01488
1861	0.02959
1862	0.04429
1863	0.059
1864	0.0737
1865	0.08841
1866	0.1031
1867	0.1178
1868	0.1325
1869	0.1473
1870	0.162
1871	0.1767
1872	0.192
1873	0.2073
1874	0.2226
1875	0.238
1876	0.2533
1877	0.2686
1878	0.2839
1879	0.2993
1880	0.3146
1881	0.3562
1882	0.3321
1883	0.3343
1884	0.3365
1885	0.3702
1886	0.404
1887	0.4377
1888	0.473
1889	0.5258
1890	0.5559
1891	0.4683
1892	0.6042
1893	0.5277
1894	0.656
1895	0.5792
1896	0.6514
1897	0.734
1898	0.759
1899	0.7656
1900	0.9147
1901	0.9963
1902	0.5252
1903	0.575
1904	0.6829
1905	0.7417
1906	0.7251
1907	0.7853
1908	1.03
1909	0.9438
1910	1.126
1911	0.9785
1912	1.121
1913	1.281
1914	1.385
1915	1.584
1916	1.742
1917	1.496
1918	1.606
1919	1.757
1920	1.843
1921	2.529
1922	2.607
1923	3.194
1924	3.37
1925	3.339
1926	3.279
1927	3.586
1928	3.72
1929	4.185
1930	4.556
1931	3.756
1932	3.131
1933	3.779
1934	4.561
1935	4.888
1936	5.069
1937	6.459
1938	6.207
1939	6.611
1940	6.147
1941	6.338
1942	6.461
1943	6.482
1944	6.297
1945	6.244
1946	6.049
1947	6.392
1948	7.438
1949	7.7
1950	8.048
1951	8.017
1952	8.826
1953	9.234
1954	9.487
1955	10.02
1956	11.05
1957	11.3
1958	11.55
1959	12.03
1960	11.16
1961	11.71
1962	12.18
1963	11.79
1964	13.42
1965	14.63
1966	14.56
1967	14.16
1968	15.26
1969	14.87
1970	15.65
1971	16.21
1972	14.67
1973	10.68
1974	12.03
1975	12.04
1976	11.91
1977	13.01
1978	15.65
1979	17.24
1980	16.22
1981	16.6
1982	16.86
1983	15.29
1984	11.84
1985	12.85
1986	13.45
1987	13.64
1988	14.65
1989	14.05
1990	14.22
1991	14.64
1992	13.14
1993	13.44
1994	14.32
1995	15.01
1996	15.44
1997	16.06
1998	18.46
1999	18.22
2000	17.78