Year	Kilotonnes
1850	0.00146
1851	0.00146
1852	0.00293
1853	0.0044
1854	0.00587
1855	0.00734
1856	0.00881
1857	0.01028
1858	0.01175
1859	0.01323
1860	0.0147
1861	0.02923
1862	0.04375
1863	0.05827
1864	0.0728
1865	0.08733
1866	0.1019
1867	0.1164
1868	0.1309
1869	0.1454
1870	0.16
1871	0.1745
1872	0.1896
1873	0.2048
1874	0.2199
1875	0.235
1876	0.2502
1877	0.2653
1878	0.2805
1879	0.2956
1880	0.3107
1881	0.3519
1882	0.328
1883	0.3302
1884	0.3323
1885	0.3657
1886	0.399
1887	0.4324
1888	0.4672
1889	0.5194
1890	0.5491
1891	0.4625
1892	0.5968
1893	0.5213
1894	0.648
1895	0.5721
1896	0.6434
1897	0.725
1898	0.7497
1899	0.7562
1900	0.9035
1901	0.9841
1902	0.5187
1903	0.568
1904	0.6745
1905	0.7326
1906	0.7162
1907	0.7757
1908	1.017
1909	0.9322
1910	1.112
1911	0.9666
1912	1.107
1913	1.266
1914	1.368
1915	1.564
1916	1.72
1917	1.477
1918	1.586
1919	1.735
1920	1.821
1921	2.498
1922	2.575
1923	3.155
1924	3.329
1925	3.299
1926	3.239
1927	3.542
1928	3.675
1929	4.134
1930	4.501
1931	3.71
1932	3.093
1933	3.733
1934	4.505
1935	4.828
1936	5.007
1937	6.379
1938	6.131
1939	6.53
1940	6.071
1941	6.261
1942	6.382
1943	6.402
1944	6.22
1945	6.167
1946	5.975
1947	6.314
1948	7.347
1949	7.606
1950	7.949
1951	7.918
1952	8.718
1953	9.121
1954	9.37
1955	9.893
1956	10.91
1957	11.16
1958	11.41
1959	11.88
1960	11.02
1961	11.57
1962	12.03
1963	11.64
1964	13.25
1965	14.45
1966	14.38
1967	13.99
1968	15.07
1969	14.68
1970	15.45
1971	16.02
1972	16.29
1973	17.66
1974	18.8
1975	17.01
1976	16.67
1977	17.94
1978	17.85
1979	18.6
1980	19.38
1981	19.79
1982	19.32
1983	19.04
1984	19.21
1985	19.28
1986	19.28
1987	19.73
1988	19.64
1989	19.73
1990	19.16
1991	19.21
1992	19.26
1993	19.31
1994	19.36
1995	19.41
1996	19.46
1997	19.51
1998	19.56
1999	19.61
2000	19.66