Year	Kilotonnes
1850	0.00348
1851	0.0039
1852	0.0078
1853	0.01165
1854	0.01545
1855	0.01933
1856	0.0235
1857	0.02763
1858	0.03131
1859	0.0353
1860	0.03918
1861	0.04621
1862	0.04672
1863	0.04941
1864	0.05384
1865	0.05467
1866	0.06102
1867	0.06935
1868	0.05736
1869	0.07907
1870	0.08709
1871	0.1176
1872	0.1221
1873	0.115
1874	0.1356
1875	0.1613
1876	0.197
1877	0.1965
1878	0.2611
1879	0.2684
1880	0.3131
1881	0.3287
1882	0.3492
1883	0.3954
1884	0.3872
1885	0.415
1886	0.4323
1887	0.4261
1888	0.4892
1889	0.5745
1890	0.5582
1891	0.593
1892	0.6361
1893	0.7212
1894	0.7924
1895	0.8683
1896	0.8967
1897	1.033
1898	1.159
1899	1.364
1900	1.548
1901	1.565
1902	1.531
1903	1.607
1904	1.759
1905	1.607
1906	1.831
1907	2.106
1908	2.142
1909	2.222
1910	2.161
1911	2.359
1912	2.57
1913	2.976
1914	2.483
1915	2.221
1916	2.441
1917	2.201
1918	0.8946
1919	0.6846
1920	0.6244
1921	0.6842
1922	0.8477
1923	0.9445
1924	1.183
1925	1.211
1926	1.826
1927	2.311
1928	2.572
1929	2.943
1930	3.589
1931	4.267
1932	4.696
1933	5.422
1934	6.634
1935	7.687
1936	8.95
1937	9.203
1938	9.77
1939	10.7
1940	12.04
1941	11.86
1942	11.7
1943	11.53
1944	11.35
1945	11.18
1946	12.27
1947	13.62
1948	15.34
1949	17.07
1950	18.77
1951	20.21
1952	21.53
1953	22.71
1954	24.67
1955	27.62
1956	30.07
1957	32.02
1958	33.32
1959	33.93
1960	34.4
1961	34.12
1962	34.97
1963	35.57
1964	36.81
1965	38.51
1966	39.28
1967	40.26
1968	40.48
1969	41.35
1970	42.6
1971	43.56
1972	44.7
1973	45.91
1974	47.57
1975	48.99
1976	49.21
1977	50.42
1978	50.9
1979	50.61
1980	50.97
1981	51.12
1982	49.06
1983	46.68
1984	48.3
1985	46.73
1986	47.35
1987	47.11
1988	48.41
1989	49.31
1990	47.67
1991	35.56
1992	29.55
1993	28.84
1994	35.32
1995	27.27
1996	25.44
1997	19.3
1998	17.8
1999	14.75
2000	8.332