Year	Kilotonnes
1850	0.01638
1851	0.01838
1852	0.03672
1853	0.05485
1854	0.07279
1855	0.09105
1856	0.1107
1857	0.1301
1858	0.1475
1859	0.1663
1860	0.1845
1861	0.2177
1862	0.22
1863	0.2327
1864	0.2536
1865	0.2575
1866	0.2874
1867	0.3266
1868	0.2702
1869	0.3724
1870	0.4102
1871	0.5539
1872	0.5751
1873	0.5417
1874	0.6385
1875	0.7599
1876	0.9277
1877	0.9256
1878	1.23
1879	1.264
1880	1.475
1881	1.548
1882	1.645
1883	1.862
1884	1.824
1885	1.954
1886	2.036
1887	2.007
1888	2.304
1889	2.706
1890	2.629
1891	2.793
1892	2.996
1893	3.397
1894	3.732
1895	4.089
1896	4.223
1897	4.864
1898	5.459
1899	6.422
1900	7.29
1901	7.372
1902	7.211
1903	7.57
1904	8.282
1905	7.568
1906	8.622
1907	9.918
1908	10.09
1909	10.47
1910	10.18
1911	11.11
1912	12.11
1913	14.02
1914	11.69
1915	10.46
1916	11.5
1917	10.36
1918	4.213
1919	3.224
1920	2.941
1921	3.223
1922	3.992
1923	4.448
1924	5.573
1925	5.701
1926	8.601
1927	10.88
1928	12.11
1929	13.86
1930	16.91
1931	20.1
1932	22.12
1933	25.53
1934	31.24
1935	36.2
1936	42.15
1937	43.34
1938	46.01
1939	50.39
1940	56.7
1941	55.88
1942	55.09
1943	54.3
1944	53.47
1945	52.66
1946	57.8
1947	64.16
1948	72.26
1949	80.38
1950	88.42
1951	95.19
1952	101.4
1953	106.9
1954	116.2
1955	130.1
1956	141.6
1957	150.8
1958	156.9
1959	159.8
1960	162
1961	160.7
1962	164.7
1963	167.5
1964	173.4
1965	181.4
1966	185
1967	189.6
1968	190.6
1969	194.7
1970	200.6
1971	205.2
1972	210.5
1973	216.2
1974	224
1975	230.8
1976	231.7
1977	237.4
1978	239.7
1979	238.4
1980	240
1981	223.8
1982	229.7
1983	222
1984	228
1985	280.7
1986	303
1987	312.3
1988	325.6
1989	318.9
1990	284.5
1991	195.9
1992	163.6
1993	156
1994	138
1995	120.2
1996	124.7
1997	118.2
1998	124.7
1999	121.8
2000	115.6