Year	Kilotonnes
1850	0.5613
1851	0.6296
1852	0.8059
1853	0.8801
1854	1.008
1855	1.161
1856	1.339
1857	1.466
1858	1.682
1859	1.651
1860	1.782
1861	1.879
1862	2.116
1863	2.352
1864	2.579
1865	2.797
1866	2.899
1867	3.176
1868	3.426
1869	3.687
1870	3.958
1871	4.636
1872	4.989
1873	5.271
1874	5.536
1875	5.64
1876	5.971
1877	5.882
1878	6.408
1879	6.808
1880	7.704
1881	8.081
1882	8.494
1883	9.359
1884	9.609
1885	9.975
1886	10.2
1887	10.31
1888	11.37
1889	12.38
1890	12.85
1891	13.55
1892	13.53
1893	14.51
1894	15.17
1895	16.19
1896	17.07
1897	18.26
1898	20.03
1899	21.41
1900	23.44
1901	23.74
1902	23.21
1903	24.27
1904	25.35
1905	25.75
1906	27.77
1907	30.59
1908	31.7
1909	32.67
1910	32.35
1911	34.59
1912	37.82
1913	41.09
1914	35.57
1915	32.74
1916	34.66
1917	32.64
1918	29.27
1919	38.18
1920	43.56
1921	45.25
1922	40.99
1923	38.63
1924	49.34
1925	46.01
1926	46.27
1927	50.24
1928	54.79
1929	61.39
1930	53.86
1931	50.41
1932	44.26
1933	41.15
1934	41.43
1935	41.96
1936	44.59
1937	51.44
1938	47.74
1939	57.92
1940	66.01
1941	66.25
1942	71.05
1943	79.67
1944	76.74
1945	43.07
1946	54.62
1947	63.56
1948	68.62
1949	77.97
1950	81.23
1951	89.12
1952	95.01
1953	97.5
1954	104.8
1955	109.6
1956	121
1957	127.7
1958	140.2
1959	133.5
1960	142.8
1961	161.4
1962	175.7
1963	189
1964	199.5
1965	197.3
1966	212.9
1967	222.4
1968	249.9
1969	284.7
1970	314.2
1971	330.8
1972	337.6
1973	330.1
1974	339.8
1975	359.4
1976	367.1
1977	379.9
1978	383.9
1979	386.5
1980	390
1981	320.5
1982	287.1
1983	321.6
1984	348
1985	306.5
1986	302
1987	307
1988	294.5
1989	286.5
1990	271
1991	222.5
1992	190
1993	162.5
1994	119.5
1995	119.5
1996	113.5
1997	101
1998	89.5
1999	85.5
2000	62