Year	Kilotonnes
1850	0.00791
1851	0.00527
1852	0.00992
1853	0.00893
1854	0.01107
1855	0.01071
1856	0.01473
1857	0.01687
1858	0.01776
1859	0.01677
1860	0.02392
1861	0.02355
1862	0.02632
1863	0.02344
1864	0.02996
1865	0.02959
1866	0.02483
1867	0.03135
1868	0.03035
1869	0.03686
1870	0.03273
1871	0.02985
1872	0.03636
1873	0.03227
1874	0.03632
1875	0.03662
1876	0.03939
1877	0.03465
1878	0.03742
1879	0.03643
1880	0.03295
1881	0.03332
1882	0.03668
1883	0.02731
1884	0.03624
1885	0.03349
1886	0.03124
1887	0.02653
1888	0.03238
1889	0.02592
1890	0.02834
1891	0.02641
1892	0.0301
1893	0.03347
1894	0.03486
1895	0.03525
1896	0.03573
1897	0.03597
1898	0.04344
1899	0.04747
1900	0.05175
1901	0.0677
1902	0.06969
1903	0.07943
1904	0.08343
1905	0.09313
1906	0.09266
1907	0.1005
1908	0.1107
1909	0.1204
1910	0.1231
1911	0.3891
1912	0.7755
1913	1.051
1914	1.728
1915	1.095
1916	1.265
1917	2.705
1918	3.767
1919	3.166
1920	3.744
1921	4.398
1922	4.315
1923	5.265
1924	6.942
1925	7.488
1926	8.954
1927	9.596
1928	13.54
1929	14.4
1930	15.53
1931	15.21
1932	15.87
1933	16.22
1934	19.8
1935	20.79
1936	23.44
1937	27.22
1938	31.08
1939	34.75
1940	39.2
1941	35.91
1942	38.35
1943	37.9
1944	39.11
1945	39.92
1946	39.2
1947	44.82
1948	48.36
1949	54.41
1950	54.7
1951	67.34
1952	67.86
1953	68.18
1954	64.27
1955	66.13
1956	69.78
1957	67.72
1958	82.01
1959	92.05
1960	100.5
1961	127
1962	121.9
1963	126.2
1964	134.6
1965	134
1966	132.8
1967	129.5
1968	137.8
1969	130.9
1970	141.5
1971	126.3
1972	119.6
1973	115.9
1974	115.8
1975	72.44
1976	93.92
1977	82.8
1978	71.49
1979	69.01
1980	76.22
1981	66.73
1982	43.58
1983	12.16
1984	17.51
1985	17.55
1986	17.2
1987	18.45
1988	20.41
1989	20.94
1990	19.18
1991	20.51
1992	20.42
1993	17.91
1994	15.96
1995	14.88
1996	14.08
1997	12.49
1998	16.23
1999	15.89
2000	16.39