Year	Kilotonnes
1850	0.5591
1851	0.6064
1852	0.6659
1853	0.7052
1854	0.76
1855	0.7846
1856	0.8195
1857	0.8052
1858	0.8181
1859	0.8868
1860	0.9825
1861	1.035
1862	1.048
1863	1.093
1864	1.173
1865	1.241
1866	1.286
1867	1.342
1868	1.365
1869	1.44
1870	1.448
1871	1.508
1872	1.664
1873	1.754
1874	1.699
1875	1.783
1876	1.822
1877	1.86
1878	1.875
1879	1.92
1880	2.125
1881	2.248
1882	2.338
1883	2.455
1884	2.41
1885	2.432
1886	2.369
1887	2.495
1888	2.589
1889	2.735
1890	2.867
1891	2.938
1892	2.889
1893	2.776
1894	3
1895	3.071
1896	3.243
1897	3.336
1898	3.382
1899	3.606
1900	3.755
1901	3.74
1902	3.782
1903	3.901
1904	3.991
1905	4.068
1906	4.322
1907	4.552
1908	4.566
1909	4.629
1910	4.804
1911	4.883
1912	5.068
1913	5.244
1914	4.749
1915	4.839
1916	5.247
1917	5.098
1918	4.794
1919	4.259
1920	4.435
1921	3.982
1922	4.331
1923	4.307
1924	12.85
1925	17.03
1926	12.7
1927	16.84
1928	20.92
1929	24.96
1930	20.68
1931	16.45
1932	12.26
1933	16.25
1934	16.16
1935	48.18
1936	67.84
1937	111
1938	145.8
1939	121.4
1940	35.04
1941	0.3853
1942	0.3813
1943	0.3774
1944	0.3734
1945	3.694
1946	29.23
1947	43.37
1948	57.19
1949	70.69
1950	56.01
1951	62.24
1952	68.46
1953	74.35
1954	90.15
1955	79.15
1956	117.4
1957	128.7
1958	104.9
1959	113
1960	111.5
1961	88.59
1962	75.32
1963	77.24
1964	49.79
1965	60.62
1966	71.16
1967	42.04
1968	60.73
1969	51.65
1970	45.5
1971	42.15
1972	54.06
1973	49.2
1974	41.46
1975	32.51
1976	27.16
1977	25.4
1978	20.46
1979	14.29
1980	14
1981	14
1982	16.5
1983	15
1984	16.5
1985	17.5
1986	19
1987	19.5
1988	21
1989	21
1990	23
1991	16.5
1992	19.5
1993	21.5
1994	21
1995	20.5
1996	22.5
1997	23.5
1998	24.5
1999	25
2000	24.57