Year	Kilotonnes
1850	0.00979
1851	0.01099
1852	0.02195
1853	0.03279
1854	0.04351
1855	0.05444
1856	0.06617
1857	0.07779
1858	0.08816
1859	0.09939
1860	0.1103
1861	0.1301
1862	0.1315
1863	0.1391
1864	0.1516
1865	0.1539
1866	0.1718
1867	0.1953
1868	0.1615
1869	0.2226
1870	0.2452
1871	0.3311
1872	0.3438
1873	0.3238
1874	0.3817
1875	0.4543
1876	0.5546
1877	0.5534
1878	0.735
1879	0.7557
1880	0.8815
1881	0.9254
1882	0.9832
1883	1.113
1884	1.09
1885	1.168
1886	1.217
1887	1.2
1888	1.377
1889	1.617
1890	1.572
1891	1.67
1892	1.791
1893	2.031
1894	2.231
1895	2.445
1896	2.525
1897	2.908
1898	3.264
1899	3.839
1900	4.358
1901	4.407
1902	4.311
1903	4.525
1904	4.951
1905	4.524
1906	5.154
1907	5.929
1908	6.031
1909	6.257
1910	6.085
1911	6.642
1912	7.237
1913	8.38
1914	6.991
1915	6.254
1916	6.874
1917	6.196
1918	2.519
1919	1.928
1920	1.758
1921	1.927
1922	2.387
1923	2.659
1924	3.332
1925	3.409
1926	5.142
1927	6.506
1928	7.241
1929	8.286
1930	10.11
1931	12.02
1932	13.22
1933	15.27
1934	18.68
1935	21.64
1936	25.2
1937	25.91
1938	27.51
1939	30.12
1940	33.9
1941	33.41
1942	32.93
1943	32.46
1944	31.97
1945	31.48
1946	34.55
1947	38.36
1948	43.2
1949	48.05
1950	52.86
1951	56.91
1952	60.63
1953	63.93
1954	69.46
1955	77.77
1956	84.67
1957	90.15
1958	93.83
1959	95.55
1960	96.86
1961	96.06
1962	98.46
1963	100.1
1964	103.6
1965	108.4
1966	110.6
1967	113.4
1968	114
1969	116.4
1970	120
1971	122.7
1972	125.9
1973	129.3
1974	133.9
1975	138
1976	138.5
1977	142
1978	143.3
1979	142.5
1980	143.5
1981	131.3
1982	129.2
1983	122.8
1984	118.2
1985	127
1986	128
1987	127.5
1988	127
1989	127
1990	126
1991	122.8
1992	93.7
1993	76.9
1994	74.55
1995	59.25
1996	62.6
1997	59.5
1998	55
1999	51.25
2000	47.73