Year	Kilotonnes
1850	0.05914
1851	0.06414
1852	0.1281
1853	0.1907
1854	0.2522
1855	0.3156
1856	0.3872
1857	0.4576
1858	0.5154
1859	0.7335
1860	1.064
1861	1.502
1862	1.671
1863	1.665
1864	2.021
1865	2.454
1866	2.421
1867	2.387
1868	2.72
1869	2.611
1870	3.116
1871	3.842
1872	4.388
1873	4.191
1874	4.261
1875	4.433
1876	5.221
1877	4.979
1878	4.679
1879	4.992
1880	5.752
1881	5.301
1882	5.842
1883	6.401
1884	6.476
1885	6.711
1886	6.927
1887	7.695
1888	8.022
1889	9.083
1890	10.07
1891	12.66
1892	12.27
1893	9.851
1894	12.33
1895	12.94
1896	13.97
1897	14.63
1898	15.42
1899	16.84
1900	18.69
1901	17.15
1902	17.24
1903	18.84
1904	20.04
1905	21.09
1906	23.4
1907	27.46
1908	27.19
1909	27.09
1910	25.88
1911	28.75
1912	29.29
1913	31.35
1914	28.54
1915	30.68
1916	28.73
1917	20.58
1918	18.7
1919	15.1
1920	23.49
1921	13.66
1922	19.55
1923	25.66
1924	24.51
1925	25.4
1926	23.63
1927	28.17
1928	28.36
1929	33.2
1930	31.16
1931	31.63
1932	32.47
1933	31.64
1934	31.38
1935	30.68
1936	31.07
1937	33.52
1938	32.17
1939	41.9
1940	28.28
1941	21.74
1942	18.51
1943	18.66
1944	12.93
1945	2.397
1946	22.02
1947	49.05
1948	60.9
1949	59.99
1950	43.62
1951	69
1952	56.82
1953	42.81
1954	56.14
1955	62.79
1956	89.11
1957	104.3
1958	71.25
1959	72.31
1960	88.68
1961	85.29
1962	99.46
1963	154.7
1964	144.4
1965	153.9
1966	151
1967	163.7
1968	146.3
1969	121.5
1970	104
1971	93.5
1972	80
1973	99.96
1974	110.3
1975	77.65
1976	60.33
1977	62.88
1978	51.38
1979	56.08
1980	58
1981	54
1982	50
1983	46
1984	42
1985	38
1986	34
1987	31
1988	28
1989	24.5
1990	22.5
1991	20.5
1992	18
1993	14.5
1994	15
1995	14.5
1996	14
1997	13
1998	12
1999	10
2000	9