Year	Kilotonnes
1850	0.02525
1851	0.02833
1852	0.0566
1853	0.08456
1854	0.1122
1855	0.1404
1856	0.1706
1857	0.2006
1858	0.2273
1859	0.2563
1860	0.2844
1861	0.3355
1862	0.3392
1863	0.3587
1864	0.3909
1865	0.3969
1866	0.443
1867	0.5035
1868	0.4164
1869	0.574
1870	0.6323
1871	0.8537
1872	0.8865
1873	0.8349
1874	0.9842
1875	1.171
1876	1.43
1877	1.427
1878	1.895
1879	1.948
1880	2.273
1881	2.386
1882	2.535
1883	2.871
1884	2.811
1885	3.013
1886	3.138
1887	3.094
1888	3.551
1889	4.17
1890	4.052
1891	4.305
1892	4.618
1893	5.236
1894	5.753
1895	6.304
1896	6.51
1897	7.498
1898	8.415
1899	9.9
1900	11.24
1901	11.36
1902	11.12
1903	11.67
1904	12.77
1905	11.67
1906	13.29
1907	15.29
1908	15.55
1909	16.13
1910	15.69
1911	17.12
1912	18.66
1913	21.61
1914	18.02
1915	16.13
1916	17.72
1917	15.98
1918	6.495
1919	4.97
1920	4.533
1921	4.967
1922	6.154
1923	6.857
1924	8.591
1925	8.789
1926	13.26
1927	16.78
1928	18.67
1929	21.37
1930	26.06
1931	30.98
1932	34.09
1933	39.36
1934	48.16
1935	55.81
1936	64.98
1937	66.81
1938	70.93
1939	77.67
1940	87.4
1941	86.14
1942	84.92
1943	83.7
1944	82.42
1945	81.18
1946	89.1
1947	98.9
1948	111.4
1949	123.9
1950	136.3
1951	146.7
1952	156.3
1953	164.8
1954	179.1
1955	200.5
1956	218.3
1957	232.4
1958	241.9
1959	246.4
1960	249.8
1961	247.7
1962	253.9
1963	258.2
1964	267.2
1965	279.6
1966	285.2
1967	292.3
1968	293.8
1969	300.2
1970	309.3
1971	316.3
1972	324.5
1973	333.3
1974	345.3
1975	355.7
1976	357.2
1977	366
1978	369.5
1979	367.4
1980	370
1981	365
1982	355
1983	355
1984	345
1985	345
1986	345
1987	380.5
1988	360
1989	334
1990	318.5
1991	326
1992	229
1993	191
1994	162
1995	137.5
1996	123.2
1997	104.2
1998	95
1999	81.85
2000	71.38