Year	Kilotonnes
1850	0.00165
1851	0.00165
1852	0.0033
1853	0.00495
1854	0.0066
1855	0.00825
1856	0.0099
1857	0.01156
1858	0.01321
1859	0.01487
1860	0.01653
1861	0.03286
1862	0.04918
1863	0.06551
1864	0.08185
1865	0.09818
1866	0.1145
1867	0.1308
1868	0.1472
1869	0.1635
1870	0.1799
1871	0.1962
1872	0.2132
1873	0.2302
1874	0.2472
1875	0.2642
1876	0.2813
1877	0.2983
1878	0.3153
1879	0.3323
1880	0.3494
1881	0.3956
1882	0.3688
1883	0.3712
1884	0.3736
1885	0.4111
1886	0.4486
1887	0.4861
1888	0.5253
1889	0.5839
1890	0.6173
1891	0.52
1892	0.6709
1893	0.586
1894	0.7285
1895	0.6431
1896	0.7233
1897	0.8151
1898	0.8428
1899	0.8502
1900	1.016
1901	1.106
1902	0.5832
1903	0.6385
1904	0.7583
1905	0.8236
1906	0.8052
1907	0.872
1908	1.143
1909	1.048
1910	1.25
1911	1.087
1912	1.245
1913	1.423
1914	1.538
1915	1.758
1916	1.934
1917	1.661
1918	1.783
1919	1.951
1920	2.047
1921	2.808
1922	2.895
1923	3.546
1924	3.742
1925	3.708
1926	3.642
1927	3.982
1928	4.131
1929	4.647
1930	5.06
1931	4.171
1932	3.477
1933	4.196
1934	5.065
1935	5.428
1936	5.629
1937	7.172
1938	6.892
1939	7.342
1940	6.826
1941	7.038
1942	7.175
1943	7.198
1944	6.992
1945	6.933
1946	6.717
1947	7.098
1948	8.26
1949	8.55
1950	8.937
1951	8.902
1952	9.801
1953	10.25
1954	10.53
1955	11.12
1956	12.27
1957	12.59
1958	11.76
1959	11.45
1960	11.13
1961	11
1962	10.99
1963	10.98
1964	10.96
1965	10.95
1966	10.94
1967	10.93
1968	10.74
1969	10.81
1970	11.07
1971	10.53
1972	10.29
1973	10.38
1974	10.83
1975	10.76
1976	10.32
1977	11.05
1978	10.54
1979	11.2
1980	16
1981	31.49
1982	36.72
1983	31.62
1984	33.47
1985	33.73
1986	33.65
1987	32.91
1988	29.06
1989	28.32
1990	23.19
1991	23.73
1992	24.95
1993	25.14
1994	27.39
1995	25.64
1996	28.67
1997	29.32
1998	29.04
1999	26.21
2000	27.6