Year	Kilotonnes
1850	0.1589
1851	0.2241
1852	0.278
1853	0.3489
1854	0.4821
1855	0.5604
1856	0.6729
1857	0.7347
1858	0.741
1859	0.8635
1860	0.9239
1861	1.09
1862	1.08
1863	1.123
1864	1.306
1865	1.353
1866	1.458
1867	1.634
1868	1.699
1869	1.659
1870	1.811
1871	1.844
1872	1.935
1873	1.986
1874	2.233
1875	2.521
1876	2.446
1877	2.869
1878	2.759
1879	2.872
1880	3.042
1881	3.215
1882	3.503
1883	3.766
1884	3.952
1885	4.393
1886	4.385
1887	4.377
1888	4.774
1889	5.199
1890	5.069
1891	5.689
1892	5.948
1893	6.109
1894	6.997
1895	7.435
1896	7.608
1897	8.114
1898	8.205
1899	9.44
1900	9.8
1901	9.397
1902	9.885
1903	9.862
1904	9.801
1905	9.8
1906	10.26
1907	11.51
1908	13.2
1909	13.59
1910	14.19
1911	14.7
1912	16.3
1913	16.83
1914	18.46
1915	20.28
1916	19.96
1917	12.7
1918	14.68
1919	16.75
1920	17.57
1921	13.53
1922	19.8
1923	21.11
1924	23.22
1925	22.98
1926	22.41
1927	29.32
1928	34.13
1929	43.44
1930	45.62
1931	37.06
1932	46.25
1933	51.25
1934	53.97
1935	55.08
1936	55.47
1937	54.85
1938	48.41
1939	53.13
1940	31.77
1941	27
1942	24.49
1943	25.22
1944	21.26
1945	14.53
1946	32.97
1947	60.09
1948	78.98
1949	100.4
1950	57.11
1951	82.42
1952	60.34
1953	62.61
1954	62.91
1955	73.33
1956	73.25
1957	72.6
1958	64.53
1959	64.08
1960	74.01
1961	105.3
1962	109.4
1963	97.43
1964	92.65
1965	80.43
1966	72.35
1967	71.57
1968	86.57
1969	83.17
1970	85.5
1971	75.3
1972	76.37
1973	77.24
1974	78.93
1975	72
1976	81.02
1977	81.28
1978	74.67
1979	73.37
1980	68.65
1981	64
1982	55.35
1983	51.9
1984	47.9
1985	49.1
1986	45.7
1987	36.5
1988	33.8
1989	28.82
1990	26
1991	22
1992	18
1993	17.5
1994	17.5
1995	16.5
1996	16.5
1997	15
1998	15
1999	14
2000	13.5