Year	Kilotonnes
1850	2.833
1851	3.178
1852	4.209
1853	3.844
1854	4.996
1855	5.134
1856	5.305
1857	6.445
1858	7.415
1859	8.398
1860	9.958
1861	10.42
1862	12.23
1863	12.75
1864	12.57
1865	13.16
1866	15.81
1867	19.59
1868	19.54
1869	22.1
1870	23.89
1871	30.62
1872	32.93
1873	33.96
1874	29.36
1875	30.48
1876	32.57
1877	33.42
1878	33.61
1879	33.88
1880	38.24
1881	41.13
1882	43.1
1883	49.24
1884	52.39
1885	52.71
1886	50.2
1887	51.67
1888	55.77
1889	58.82
1890	65.63
1891	69.85
1892	73.3
1893	79.45
1894	86.05
1895	93.02
1896	100.2
1897	102.3
1898	117.8
1899	113.6
1900	133.3
1901	134.5
1902	129.7
1903	134.2
1904	137.8
1905	148.3
1906	157.2
1907	160.9
1908	173.3
1909	187.7
1910	187.6
1911	196.5
1912	199.9
1913	214.6
1914	192.6
1915	192.2
1916	192.8
1917	189.1
1918	168
1919	146.6
1920	125.6
1921	139.5
1922	157.8
1923	175.1
1924	166.5
1925	145.2
1926	148.2
1927	167.6
1928	174.7
1929	186.5
1930	160.2
1931	152.3
1932	145.9
1933	145.3
1934	153.4
1935	163.8
1936	173.7
1937	195.8
1938	201.1
1939	227.3
1940	246
1941	271.3
1942	283.9
1943	283.8
1944	232.5
1945	112.1
1946	176.1
1947	260.2
1948	336.6
1949	408.2
1950	461.5
1951	507
1952	587.5
1953	633.6
1954	617.3
1955	606.7
1956	566.7
1957	615.1
1958	674.6
1959	704.8
1960	739
1961	788.6
1962	806.2
1963	873.2
1964	922.5
1965	908
1966	883.7
1967	795.2
1968	807.6
1969	794.5
1970	850.6
1971	844.6
1972	809.6
1973	847.3
1974	833.2
1975	821.7
1976	821.6
1977	834
1978	830.6
1979	830.6
1980	816.5
1981	790
1982	772.5
1983	740
1984	720
1985	702
1986	681
1987	642.5
1988	609
1989	551
1990	505
1991	456.5
1992	413.5
1993	378.5
1994	370.5
1995	352.5
1996	336.5
1997	329.5
1998	296
1999	295
2000	243