Year	Kilotonnes
1850	0
1851	0.158
1852	0.3161
1853	0.4741
1854	0.6321
1855	0.7902
1856	0.9482
1857	1.106
1858	1.264
1859	1.422
1860	1.58
1861	1.726
1862	1.87
1863	2.012
1864	2.152
1865	2.289
1866	2.425
1867	2.558
1868	2.689
1869	2.818
1870	2.944
1871	3.069
1872	3.191
1873	3.311
1874	3.43
1875	3.545
1876	3.659
1877	3.771
1878	3.88
1879	3.987
1880	4.125
1881	4.123
1882	4.111
1883	4.091
1884	4.062
1885	4.024
1886	3.977
1887	3.921
1888	3.855
1889	3.781
1890	3.698
1891	3.606
1892	3.505
1893	3.394
1894	3.275
1895	3.147
1896	3.01
1897	2.863
1898	2.708
1899	2.544
1900	2.371
1901	2.378
1902	2.417
1903	2.455
1904	2.491
1905	2.526
1906	2.559
1907	2.591
1908	2.621
1909	2.65
1910	2.676
1911	2.702
1912	2.726
1913	2.748
1914	2.768
1915	2.787
1916	2.805
1917	2.82
1918	2.835
1919	2.847
1920	2.858
1921	2.924
1922	2.958
1923	3.89
1924	4.073
1925	4.032
1926	4.291
1927	5.447
1928	5.78
1929	5.001
1930	5.535
1931	4.295
1932	4.008
1933	5.06
1934	5.057
1935	5.27
1936	5.542
1937	5.349
1938	5.162
1939	5.053
1940	4.812
1941	4.607
1942	3.953
1943	3.298
1944	2.643
1945	1.989
1946	1.335
1947	0.6852
1948	0.186
1949	0.2008
1950	1.654
1951	12.25
1952	20.35
1953	28.46
1954	36
1955	42.56
1956	50.02
1957	57.26
1958	64.39
1959	71.22
1960	76.53
1961	67.97
1962	106.7
1963	63.78
1964	52.27
1965	34.99
1966	29.48
1967	21.42
1968	18.84
1969	17.7
1970	13.6
1971	15.66
1972	16.01
1973	16.17
1974	19.28
1975	7.952
1976	2.533
1977	2.299
1978	2.656
1979	2.066
1980	2.219
1981	2.374
1982	2.507
1983	4.538
1984	8.027
1985	10
1986	10.2
1987	9.6
1988	9.3
1989	9.55
1990	9.6
1991	9.75
1992	9.9
1993	10.15
1994	10.25
1995	10.4
1996	10.45
1997	10.65
1998	11.11
1999	14.88
2000	15.53