Year	Kilotonnes
1850	0.00481
1851	0.0054
1852	0.00691
1853	0.01383
1854	0.02076
1855	0.02769
1856	0.03464
1857	0.04159
1858	0.04856
1859	0.05553
1860	0.06251
1861	0.0695
1862	0.0765
1863	0.08351
1864	0.09053
1865	0.09756
1866	0.1046
1867	0.1116
1868	0.1187
1869	0.1258
1870	0.1328
1871	0.1399
1872	0.147
1873	0.1541
1874	0.1612
1875	0.1683
1876	0.1755
1877	0.1826
1878	0.1897
1879	0.1969
1880	0.2041
1881	0.2112
1882	0.2184
1883	0.2256
1884	0.2328
1885	0.24
1886	0.2472
1887	0.2545
1888	0.2617
1889	0.2689
1890	0.2762
1891	0.2835
1892	0.2907
1893	0.298
1894	0.3053
1895	0.2888
1896	0.214
1897	0.2885
1898	0.3005
1899	0.3124
1900	0.3861
1901	0.4799
1902	0.5432
1903	0.4971
1904	0.5129
1905	0.5941
1906	0.5936
1907	0.885
1908	0.8813
1909	0.961
1910	0.9704
1911	0.9316
1912	1.041
1913	1.109
1914	1.789
1915	2.469
1916	3.149
1917	3.828
1918	4.508
1919	5.188
1920	5.867
1921	6.547
1922	8.822
1923	5.302
1924	6.396
1925	7.159
1926	7.911
1927	8.566
1928	10.43
1929	12.12
1930	14.3
1931	15.46
1932	14.89
1933	13.89
1934	15.59
1935	17.42
1936	18.37
1937	17.73
1938	20.61
1939	22.38
1940	23.2
1941	24.73
1942	19.02
1943	16.44
1944	14.05
1945	11.82
1946	8.639
1947	17.86
1948	25.7
1949	31.3
1950	36.88
1951	40.92
1952	36.3
1953	35.38
1954	32.75
1955	36.73
1956	39.19
1957	44.34
1958	46.87
1959	48.18
1960	52.89
1961	56.38
1962	59.92
1963	62.66
1964	70.33
1965	76.58
1966	75.47
1967	77.85
1968	73.02
1969	76.74
1970	79.32
1971	87.93
1972	94.77
1973	93.35
1974	100.6
1975	103.3
1976	109.2
1977	110.3
1978	109.1
1979	112
1980	117
1981	127
1982	128
1983	137
1984	125
1985	120.5
1986	123.5
1987	111
1988	105
1989	105.5
1990	98
1991	90
1992	93
1993	91.5
1994	88.5
1995	62.5
1996	56
1997	59
1998	61.5
1999	52
2000	48