Year	Kilotonnes
1850	0.00104
1851	0.00104
1852	0.00208
1853	0.00312
1854	0.00417
1855	0.00521
1856	0.00625
1857	0.0073
1858	0.00834
1859	0.00939
1860	0.01044
1861	0.02075
1862	0.03106
1863	0.04137
1864	0.05168
1865	0.06199
1866	0.07231
1867	0.08262
1868	0.09294
1869	0.1033
1870	0.1136
1871	0.1239
1872	0.1346
1873	0.1454
1874	0.1561
1875	0.1669
1876	0.1776
1877	0.1884
1878	0.1991
1879	0.2098
1880	0.2206
1881	0.2498
1882	0.2329
1883	0.2344
1884	0.2359
1885	0.2596
1886	0.2833
1887	0.3069
1888	0.3317
1889	0.3687
1890	0.3898
1891	0.3283
1892	0.4236
1893	0.37
1894	0.46
1895	0.4061
1896	0.4567
1897	0.5147
1898	0.5322
1899	0.5368
1900	0.6414
1901	0.6986
1902	0.3682
1903	0.4032
1904	0.4788
1905	0.5201
1906	0.5084
1907	0.5506
1908	0.722
1909	0.6618
1910	0.7896
1911	0.6862
1912	0.7861
1913	0.8984
1914	0.9711
1915	1.11
1916	1.221
1917	1.049
1918	1.126
1919	1.232
1920	1.293
1921	1.773
1922	1.828
1923	2.239
1924	2.363
1925	2.342
1926	2.299
1927	2.514
1928	2.609
1929	2.935
1930	3.195
1931	2.633
1932	2.196
1933	2.65
1934	3.198
1935	3.427
1936	3.554
1937	4.529
1938	4.352
1939	4.636
1940	4.31
1941	4.444
1942	4.531
1943	4.545
1944	4.415
1945	4.378
1946	4.241
1947	4.482
1948	5.216
1949	5.399
1950	5.643
1951	5.621
1952	6.189
1953	6.475
1954	6.652
1955	7.023
1956	7.747
1957	7.925
1958	8.098
1959	8.435
1960	7.825
1961	8.21
1962	8.54
1963	8.265
1964	9.409
1965	10.26
1966	10.21
1967	9.929
1968	10.7
1969	10.42
1970	10.97
1971	11.37
1972	11.57
1973	12.54
1974	13.34
1975	12.08
1976	11.84
1977	12.73
1978	12.67
1979	13.21
1980	13.76
1981	14.05
1982	13.71
1983	13.52
1984	13.63
1985	13.68
1986	13.69
1987	14.01
1988	13.94
1989	14
1990	13.6
1991	13.71
1992	13.83
1993	13.94
1994	14.06
1995	14.17
1996	14.29
1997	14.41
1998	14.53
1999	14.65
2000	14.77