Year	Kilotonnes
1850	0.00309
1851	0.00346
1852	0.00443
1853	0.00886
1854	0.0133
1855	0.01775
1856	0.0222
1857	0.02666
1858	0.03113
1859	0.0356
1860	0.04007
1861	0.04455
1862	0.04904
1863	0.05353
1864	0.05803
1865	0.06254
1866	0.06705
1867	0.07156
1868	0.07609
1869	0.08061
1870	0.08515
1871	0.08969
1872	0.09423
1873	0.09878
1874	0.1033
1875	0.1079
1876	0.1125
1877	0.117
1878	0.1216
1879	0.1262
1880	0.1308
1881	0.1354
1882	0.14
1883	0.1446
1884	0.1492
1885	0.1539
1886	0.1585
1887	0.1631
1888	0.1678
1889	0.1724
1890	0.177
1891	0.1817
1892	0.1864
1893	0.191
1894	0.1957
1895	0.1852
1896	0.1372
1897	0.185
1898	0.1926
1899	0.2003
1900	0.2475
1901	0.3076
1902	0.3482
1903	0.3187
1904	0.3288
1905	0.3809
1906	0.3805
1907	0.5673
1908	0.5649
1909	0.616
1910	0.6221
1911	0.5972
1912	0.6675
1913	0.7111
1914	1.147
1915	1.583
1916	2.018
1917	2.454
1918	2.89
1919	3.325
1920	3.761
1921	4.197
1922	5.655
1923	3.399
1924	4.1
1925	4.589
1926	5.071
1927	5.491
1928	6.684
1929	7.771
1930	9.163
1931	9.909
1932	9.542
1933	8.904
1934	9.995
1935	11.17
1936	11.77
1937	11.36
1938	13.21
1939	14.34
1940	14.87
1941	15.85
1942	12.19
1943	10.54
1944	9.007
1945	7.579
1946	5.538
1947	11.45
1948	16.47
1949	20.07
1950	23.64
1951	26.23
1952	23.27
1953	22.68
1954	21
1955	23.55
1956	25.12
1957	28.42
1958	30.05
1959	30.88
1960	33.91
1961	36.14
1962	38.41
1963	40.17
1964	45.08
1965	49.09
1966	48.38
1967	49.91
1968	46.81
1969	49.19
1970	50.85
1971	56.37
1972	60.75
1973	59.84
1974	64.5
1975	66.21
1976	70.01
1977	70.73
1978	69.9
1979	71.79
1980	75
1981	75.37
1982	75.55
1983	81.28
1984	84.24
1985	88.3
1986	86.82
1987	89.41
1988	92.73
1989	93.47
1990	90
1991	54
1992	53.35
1993	56.85
1994	44.65
1995	35.2
1996	33.1
1997	40.2
1998	44.75
1999	45.35
2000	29.05