Year	Kilotonnes
1850	0.00117
1851	0.00117
1852	0.00234
1853	0.00351
1854	0.00468
1855	0.00585
1856	0.00702
1857	0.0082
1858	0.00937
1859	0.01055
1860	0.01172
1861	0.02331
1862	0.03489
1863	0.04647
1864	0.05806
1865	0.06964
1866	0.08123
1867	0.09282
1868	0.1044
1869	0.116
1870	0.1276
1871	0.1392
1872	0.1512
1873	0.1633
1874	0.1754
1875	0.1874
1876	0.1995
1877	0.2116
1878	0.2237
1879	0.2357
1880	0.2478
1881	0.2806
1882	0.2616
1883	0.2633
1884	0.265
1885	0.2916
1886	0.3182
1887	0.3448
1888	0.3726
1889	0.4142
1890	0.4379
1891	0.3689
1892	0.4759
1893	0.4157
1894	0.5168
1895	0.4562
1896	0.5131
1897	0.5782
1898	0.5979
1899	0.7511
1900	1.224
1901	1.308
1902	1.448
1903	2.075
1904	2.16
1905	2.272
1906	2.677
1907	2.734
1908	3.07
1909	4.439
1910	5.195
1911	6.23
1912	6.959
1913	6.235
1914	6.461
1915	7.345
1916	7.291
1917	6.552
1918	7.843
1919	8.294
1920	9.656
1921	12.25
1922	13.03
1923	15.36
1924	14.55
1925	15.69
1926	12.64
1927	12.38
1928	14.63
1929	18.26
1930	19.96
1931	20.82
1932	25.96
1933	26.62
1934	28.07
1935	30.88
1936	32.93
1937	35.26
1938	38.55
1939	39.22
1940	52.18
1941	52.24
1942	49.34
1943	50.6
1944	49.09
1945	49.65
1946	50.81
1947	53.22
1948	53.88
1949	55.55
1950	45.43
1951	46.3
1952	49.78
1953	53.1
1954	57.06
1955	63.04
1956	67.58
1957	69.56
1958	61.43
1959	68.53
1960	65.34
1961	57.38
1962	53.24
1963	51.88
1964	36.68
1965	42.56
1966	46.09
1967	41.67
1968	46.89
1969	51.53
1970	63.84
1971	66.04
1972	61.18
1973	70.1
1974	70.39
1975	64.82
1976	68.21
1977	65.32
1978	61.19
1979	64
1980	69.64
1981	63.36
1982	58.44
1983	54.53
1984	58.2
1985	60.22
1986	69.8
1987	86.72
1988	79.32
1989	81.92
1990	81.89
1991	96.73
1992	104.9
1993	90.51
1994	85.28
1995	80.61
1996	76.83
1997	71.82
1998	76.58
1999	85
2000	84