Year	Kilotonnes
1850	0.00122
1851	0.00122
1852	0.00244
1853	0.00366
1854	0.00489
1855	0.00611
1856	0.00734
1857	0.00856
1858	0.00979
1859	0.01101
1860	0.01224
1861	0.02434
1862	0.03643
1863	0.04853
1864	0.06063
1865	0.07272
1866	0.08482
1867	0.09692
1868	0.109
1869	0.1211
1870	0.1332
1871	0.1453
1872	0.1579
1873	0.1705
1874	0.1831
1875	0.1957
1876	0.2083
1877	0.2209
1878	0.2336
1879	0.2462
1880	0.2588
1881	0.293
1882	0.2732
1883	0.275
1884	0.2768
1885	0.3045
1886	0.3323
1887	0.3601
1888	0.3891
1889	0.4325
1890	0.4572
1891	0.3852
1892	0.497
1893	0.4341
1894	0.5396
1895	0.4764
1896	0.5358
1897	0.6038
1898	0.6243
1899	0.6297
1900	0.7524
1901	0.8195
1902	0.432
1903	0.473
1904	0.5617
1905	0.6101
1906	0.5964
1907	0.6459
1908	0.847
1909	0.7763
1910	0.9263
1911	0.8049
1912	0.9222
1913	1.054
1914	1.139
1915	1.303
1916	1.433
1917	1.23
1918	1.321
1919	1.445
1920	1.516
1921	2.08
1922	2.144
1923	2.627
1924	2.772
1925	2.747
1926	2.697
1927	2.95
1928	3.06
1929	3.443
1930	3.748
1931	3.089
1932	2.576
1933	3.108
1934	3.751
1935	4.02
1936	4.17
1937	5.313
1938	5.105
1939	5.438
1940	5.056
1941	5.214
1942	5.315
1943	5.331
1944	5.18
1945	5.136
1946	4.976
1947	5.258
1948	6.118
1949	6.334
1950	6.62
1951	7.048
1952	1.018
1953	1.618
1954	1.151
1955	0.6997
1956	0.2485
1957	0.3294
1958	0.4103
1959	0.4912
1960	0.5722
1961	0.6531
1962	0.734
1963	0.8149
1964	11.52
1965	17.48
1966	16.86
1967	19.48
1968	21.07
1969	21.04
1970	19.23
1971	18.31
1972	19.24
1973	19.77
1974	20.89
1975	21.09
1976	19.53
1977	22.99
1978	21.95
1979	23.44
1980	23.22
1981	21.59
1982	16.17
1983	11.37
1984	12.89
1985	10.37
1986	15.42
1987	17.05
1988	19.49
1989	16.95
1990	18.2
1991	15.55
1992	16.74
1993	15.92
1994	9.906
1995	18.96
1996	18.83
1997	21.51
1998	21.98
1999	22.48
2000	23.59