Year	Kilotonnes
1850	0.01051
1851	0.01179
1852	0.02356
1853	0.03519
1854	0.0467
1855	0.05842
1856	0.07101
1857	0.08348
1858	0.09461
1859	0.1067
1860	0.1184
1861	0.1396
1862	0.1412
1863	0.1493
1864	0.1627
1865	0.1652
1866	0.1844
1867	0.2096
1868	0.1733
1869	0.2389
1870	0.2632
1871	0.3553
1872	0.369
1873	0.3475
1874	0.4096
1875	0.4875
1876	0.5952
1877	0.5939
1878	0.7888
1879	0.8109
1880	0.946
1881	0.9931
1882	1.055
1883	1.195
1884	1.17
1885	1.254
1886	1.306
1887	1.288
1888	1.478
1889	1.736
1890	1.687
1891	1.792
1892	1.922
1893	2.179
1894	2.394
1895	2.624
1896	2.709
1897	3.121
1898	3.503
1899	4.12
1900	4.677
1901	4.73
1902	4.627
1903	4.857
1904	5.314
1905	4.856
1906	5.531
1907	6.363
1908	6.472
1909	6.715
1910	6.53
1911	7.128
1912	7.766
1913	8.993
1914	7.502
1915	6.712
1916	7.377
1917	6.65
1918	2.703
1919	2.069
1920	1.887
1921	2.068
1922	2.561
1923	2.854
1924	3.576
1925	3.658
1926	5.518
1927	6.983
1928	7.771
1929	8.892
1930	10.85
1931	12.89
1932	14.19
1933	16.38
1934	20.04
1935	23.23
1936	27.04
1937	27.81
1938	29.52
1939	32.33
1940	36.38
1941	35.85
1942	35.34
1943	34.84
1944	34.31
1945	33.79
1946	37.08
1947	41.16
1948	46.36
1949	51.57
1950	56.73
1951	61.07
1952	65.06
1953	68.61
1954	74.54
1955	83.46
1956	90.87
1957	96.74
1958	100.7
1959	102.5
1960	104
1961	103.1
1962	105.7
1963	107.5
1964	111.2
1965	116.4
1966	118.7
1967	121.7
1968	122.3
1969	124.9
1970	128.7
1971	131.6
1972	135.1
1973	138.7
1974	143.7
1975	148
1976	148.7
1977	152.3
1978	153.8
1979	152.9
1980	154
1981	152.5
1982	143.5
1983	142
1984	135
1985	141
1986	148.5
1987	158.5
1988	136.5
1989	119
1990	132.5
1991	129.9
1992	84.1
1993	78.2
1994	54.25
1995	32.03
1996	33.52
1997	18.07
1998	16.04
1999	6.025
2000	6