Year	Kilotonnes
1850	0.00481
1851	0.0054
1852	0.01079
1853	0.01611
1854	0.02138
1855	0.02674
1856	0.03251
1857	0.03822
1858	0.04331
1859	0.04883
1860	0.0542
1861	0.06393
1862	0.06462
1863	0.06835
1864	0.07448
1865	0.07562
1866	0.08441
1867	0.09593
1868	0.07935
1869	0.1094
1870	0.1205
1871	0.1627
1872	0.1689
1873	0.1591
1874	0.1875
1875	0.2232
1876	0.2725
1877	0.2719
1878	0.3611
1879	0.3712
1880	0.4331
1881	0.4546
1882	0.4831
1883	0.547
1884	0.5357
1885	0.574
1886	0.598
1887	0.5895
1888	0.6767
1889	0.7946
1890	0.7721
1891	0.8203
1892	0.8799
1893	0.9977
1894	1.096
1895	1.201
1896	1.24
1897	1.429
1898	1.603
1899	1.886
1900	2.141
1901	2.165
1902	2.118
1903	2.223
1904	2.433
1905	2.223
1906	2.532
1907	2.913
1908	2.963
1909	3.074
1910	2.989
1911	3.263
1912	3.555
1913	4.117
1914	3.434
1915	3.073
1916	3.377
1917	3.044
1918	1.237
1919	0.947
1920	0.8638
1921	0.9465
1922	1.173
1923	1.306
1924	1.637
1925	1.675
1926	2.526
1927	3.197
1928	3.558
1929	4.071
1930	4.965
1931	5.903
1932	6.496
1933	7.5
1934	9.176
1935	10.63
1936	12.38
1937	12.73
1938	13.51
1939	14.8
1940	16.65
1941	16.41
1942	16.18
1943	15.95
1944	15.7
1945	15.47
1946	16.98
1947	18.84
1948	21.22
1949	23.61
1950	25.97
1951	27.96
1952	29.78
1953	31.41
1954	34.13
1955	38.21
1956	41.6
1957	44.29
1958	46.1
1959	46.94
1960	47.59
1961	47.19
1962	48.37
1963	49.2
1964	50.92
1965	53.28
1966	54.34
1967	55.69
1968	55.99
1969	57.19
1970	58.93
1971	60.26
1972	61.83
1973	63.51
1974	65.8
1975	67.77
1976	68.07
1977	69.74
1978	70.41
1979	70.01
1980	70.5
1981	55.35
1982	50.65
1983	55.15
1984	48.45
1985	50.1
1986	55.6
1987	55.3
1988	52.05
1989	31.35
1990	36
1991	29.75
1992	22.05
1993	2.75
1994	2.1
1995	1.25
1996	0.75
1997	0.2
1998	1.655
1999	0.42
2000	4.201