Year	Kilotonnes
1850	0.00786
1851	0.00881
1852	0.01761
1853	0.0263
1854	0.0349
1855	0.04366
1856	0.05307
1857	0.0624
1858	0.07071
1859	0.07972
1860	0.08849
1861	0.1044
1862	0.1055
1863	0.1116
1864	0.1216
1865	0.1235
1866	0.1378
1867	0.1566
1868	0.1295
1869	0.1786
1870	0.1967
1871	0.2656
1872	0.2758
1873	0.2597
1874	0.3062
1875	0.3644
1876	0.4448
1877	0.4439
1878	0.5896
1879	0.6061
1880	0.7071
1881	0.7423
1882	0.7886
1883	0.893
1884	0.8746
1885	0.9371
1886	0.9763
1887	0.9624
1888	1.105
1889	1.297
1890	1.261
1891	1.339
1892	1.437
1893	1.629
1894	1.79
1895	1.961
1896	2.025
1897	2.332
1898	2.618
1899	3.08
1900	3.496
1901	3.535
1902	3.458
1903	3.63
1904	3.971
1905	3.629
1906	4.134
1907	4.756
1908	4.837
1909	5.019
1910	4.88
1911	5.327
1912	5.805
1913	6.722
1914	5.607
1915	5.017
1916	5.514
1917	4.97
1918	2.02
1919	1.546
1920	1.41
1921	1.545
1922	1.914
1923	2.133
1924	2.673
1925	2.734
1926	4.124
1927	5.219
1928	5.808
1929	6.646
1930	8.106
1931	9.638
1932	10.61
1933	12.24
1934	14.98
1935	17.36
1936	20.21
1937	20.78
1938	22.06
1939	24.16
1940	27.19
1941	26.8
1942	26.42
1943	26.04
1944	25.64
1945	25.25
1946	27.72
1947	30.77
1948	34.65
1949	38.54
1950	42.4
1951	45.65
1952	48.63
1953	51.28
1954	55.71
1955	62.38
1956	67.91
1957	72.3
1958	75.26
1959	76.64
1960	77.69
1961	77.05
1962	78.98
1963	80.32
1964	83.13
1965	86.98
1966	88.71
1967	90.93
1968	91.41
1969	93.37
1970	96.21
1971	98.38
1972	100.9
1973	103.7
1974	107.4
1975	110.6
1976	111.1
1977	113.9
1978	115
1979	114.3
1980	115.1
1981	121
1982	125
1983	133.7
1984	133.3
1985	136.6
1986	127.7
1987	129.2
1988	127.7
1989	124.5
1990	124.2
1991	97
1992	67.6
1993	35.7
1994	23.45
1995	10.15
1996	15.05
1997	16.55
1998	10.09
1999	4.305
2000	4.5