Year	Kilotonnes
1850	0
1851	0
1852	0
1853	0
1854	0
1855	0.00001
1856	0.00001
1857	0.00001
1858	0.00001
1859	0.00001
1860	0.00001
1861	0.00001
1862	0.00001
1863	0.00001
1864	0.00002
1865	0.00002
1866	0.00002
1867	0.00002
1868	0.00002
1869	0.00002
1870	0.00002
1871	0.00002
1872	0.00003
1873	0.00003
1874	0.00003
1875	0.00003
1876	0.00003
1877	0.00003
1878	0.00003
1879	0.00003
1880	0.00003
1881	0.00005
1882	0.00007
1883	0.00009
1884	0.00011
1885	0.00013
1886	0.00015
1887	0.00016
1888	0.00018
1889	0.0002
1890	0.00022
1891	0.00023
1892	0.00024
1893	0.00024
1894	0.00024
1895	0.00024
1896	0.00035
1897	0.00045
1898	0.00055
1899	0.00066
1900	0.00077
1901	0.00092
1902	0.00144
1903	0.00202
1904	0.00346
1905	0.00315
1906	0.00365
1907	0.00435
1908	0.00485
1909	0.00516
1910	0.00534
1911	0.00571
1912	0.00718
1913	0.00817
1914	0.00641
1915	0.00479
1916	0.00799
1917	0.00748
1918	0.00675
1919	0.00514
1920	0.00617
1921	0.00607
1922	0.01214
1923	0.01822
1924	0.2628
1925	0.2675
1926	0.654
1927	1.628
1928	1.754
1929	2.022
1930	2.765
1931	1.721
1932	3.715
1933	4.53
1934	3.601
1935	4.543
1936	6.01
1937	7.707
1938	6.871
1939	10.22
1940	10.62
1941	9.055
1942	9.85
1943	10.43
1944	12.76
1945	13.68
1946	14.55
1947	18.58
1948	23.4
1949	22.66
1950	19.92
1951	23.62
1952	30.66
1953	37.36
1954	34.41
1955	32.06
1956	34.63
1957	35.3
1958	37.47
1959	35.04
1960	35.57
1961	35
1962	35.18
1963	39.27
1964	43.2
1965	44.44
1966	47.33
1967	46.18
1968	47.44
1969	44.95
1970	48.98
1971	50.35
1972	56.31
1973	60.24
1974	64.62
1975	63.39
1976	60.64
1977	67.91
1978	72.87
1979	87.13
1980	85.71
1981	97.04
1982	107.9
1983	105.2
1984	107
1985	110.1
1986	98.59
1987	101.6
1988	102.5
1989	106.8
1990	106.9
1991	105.8
1992	109
1993	108.5
1994	109.4
1995	119.4
1996	118.4
1997	122.3
1998	125.7
1999	136
2000	140.8