Year	Kilotonnes
1850	0.9147
1851	0.7335
1852	0.9182
1853	0.3711
1854	0.1899
1855	0.1916
1856	0.7422
1857	0.7439
1858	0.7457
1859	0.7474
1860	0.9321
1861	0.9338
1862	1.118
1863	1.303
1864	1.67
1865	1.489
1866	2.223
1867	2.957
1868	3.142
1869	3.144
1870	1.683
1871	2.052
1872	2.238
1873	2.241
1874	2.061
1875	2.064
1876	2.064
1877	2.246
1878	1.697
1879	2.418
1880	3.14
1881	3.532
1882	3.956
1883	4.421
1884	5.042
1885	5.353
1886	5.602
1887	5.863
1888	6.443
1889	6.156
1890	6.696
1891	7.029
1892	7.073
1893	7.272
1894	7.564
1895	7.639
1896	8.346
1897	8.847
1898	9.555
1899	10.27
1900	11.53
1901	12.94
1902	14.37
1903	14.98
1904	16.22
1905	16.74
1906	18.26
1907	19.34
1908	19.67
1909	20.21
1910	23.24
1911	21.86
1912	23.05
1913	19.98
1914	24.1
1915	23.4
1916	23.92
1917	21.92
1918	21.58
1919	19.6
1920	19.58
1921	19.21
1922	19.74
1923	20.94
1924	22.14
1925	22.48
1926	23.82
1927	25.19
1928	25.93
1929	27
1930	27.08
1931	22.99
1932	19.63
1933	19.42
1934	21.97
1935	22.78
1936	22.85
1937	24.33
1938	23.74
1939	25.03
1940	26.9
1941	28.22
1942	28.67
1943	29.84
1944	30.04
1945	30.35
1946	29.93
1947	29.49
1948	29.76
1949	30.18
1950	26.95
1951	24.22
1952	27.64
1953	25.46
1954	26.39
1955	26.13
1956	26.81
1957	26.87
1958	27.85
1959	28.82
1960	31
1961	30.25
1962	26.42
1963	28.3
1964	37.08
1965	42.71
1966	43.54
1967	40.64
1968	39.02
1969	39.75
1970	39.2
1971	37.73
1972	38.87
1973	41.65
1974	45.35
1975	42.21
1976	39.72
1977	38.85
1978	33.97
1979	33.25
1980	36.69
1981	32.79
1982	30.12
1983	29.2
1984	28.52
1985	23.47
1986	25.03
1987	30.47
1988	30.27
1989	32.31
1990	30.5
1991	30
1992	32.5
1993	33.5
1994	34
1995	35
1996	36
1997	29.5
1998	29.5
1999	30
2000	31