Year	Kilotonnes
1850	0.5602
1851	0.7147
1852	0.8688
1853	1.02
1854	1.17
1855	1.323
1856	1.492
1857	1.659
1858	1.802
1859	1.961
1860	2.107
1861	2.317
1862	3.575
1863	3.265
1864	4.216
1865	3.789
1866	4.423
1867	5.53
1868	15.98
1869	22.86
1870	27.28
1871	18.28
1872	25.01
1873	24.05
1874	21.43
1875	20.87
1876	24.01
1877	28.04
1878	22.36
1879	25.69
1880	29.4
1881	28.83
1882	33.7
1883	36.84
1884	39.55
1885	42.66
1886	42.32
1887	44.58
1888	45.93
1889	49.01
1890	54.13
1891	52.62
1892	54.11
1893	53.38
1894	61.77
1895	57
1896	54.65
1897	57.04
1898	59.73
1899	66.94
1900	67.4
1901	65.03
1902	68.77
1903	71.84
1904	73.51
1905	78.51
1906	90.22
1907	96.59
1908	96.08
1909	100.7
1910	101.1
1911	101.5
1912	104.5
1913	110.9
1914	99.24
1915	83.17
1916	84.13
1917	60.15
1918	69.51
1919	67.68
1920	68.83
1921	76.66
1922	89.56
1923	98.54
1924	118
1925	112.9
1926	124.2
1927	145.4
1928	133.1
1929	156.5
1930	142.7
1931	116.9
1932	95.22
1933	102.4
1934	133.6
1935	151.6
1936	103.9
1937	145
1938	143.9
1939	155.2
1940	164.6
1941	100.2
1942	68.1
1943	40.79
1944	22.03
1945	13.26
1946	18.96
1947	51.16
1948	69.51
1949	110.8
1950	185.7
1951	252.9
1952	243.6
1953	264.8
1954	283.6
1955	297.6
1956	328.3
1957	353.6
1958	349.4
1959	370.3
1960	429.1
1961	484.2
1962	560.5
1963	654.3
1964	719.1
1965	844.3
1966	961.3
1967	1090
1968	1173
1969	1241
1970	1415
1971	1444
1972	1478
1973	1535
1974	1604
1975	1644
1976	1661
1977	1650
1978	1638
1979	1621
1980	1878
1981	1665
1982	1425
1983	1232
1984	1057
1985	950.5
1986	964.5
1987	1014
1988	981.5
1989	927
1990	886.5
1991	828
1992	778.5
1993	727
1994	679.5
1995	643.5
1996	614
1997	575.5
1998	508
1999	461
2000	385.5