Year	Kilotonnes
1850	0.0666
1851	0.07223
1852	0.1443
1853	0.2153
1854	0.2853
1855	0.3569
1856	0.4353
1857	0.5128
1858	0.5798
1859	0.654
1860	0.7226
1861	0.7982
1862	0.8748
1863	0.9452
1864	1.014
1865	1.084
1866	1.155
1867	1.235
1868	1.306
1869	1.372
1870	1.462
1871	1.538
1872	1.593
1873	2.107
1874	1.669
1875	3.231
1876	3.226
1877	2.083
1878	2.011
1879	2.19
1880	2.617
1881	2.707
1882	3.203
1883	3.412
1884	3.659
1885	3.489
1886	3.795
1887	3.944
1888	4.258
1889	4.881
1890	5.233
1891	5.388
1892	5.275
1893	4.698
1894	5.502
1895	5.233
1896	5.333
1897	5.615
1898	6.242
1899	6.5
1900	7.414
1901	7.319
1902	7.909
1903	7.795
1904	8.005
1905	7.85
1906	8.985
1907	9.849
1908	9.809
1909	9.906
1910	10.03
1911	9.64
1912	10.88
1913	11.36
1914	9.955
1915	9.158
1916	9.054
1917	5.603
1918	4.063
1919	7.328
1920	7.414
1921	7.118
1922	9.54
1923	9.002
1924	9.953
1925	10.03
1926	9.563
1927	11.71
1928	11.91
1929	13.26
1930	14.39
1931	12.64
1932	9.849
1933	11.84
1934	12.34
1935	13.52
1936	12.87
1937	15.56
1938	12.95
1939	16.53
1940	13.52
1941	13.47
1942	11.96
1943	12.45
1944	13.7
1945	14.39
1946	17.29
1947	26.45
1948	24.11
1949	25.42
1950	20.06
1951	20.51
1952	20.34
1953	16.64
1954	23.46
1955	27.04
1956	29.21
1957	33.89
1958	32.74
1959	32.79
1960	33.14
1961	34.66
1962	34.8
1963	39.94
1964	40.94
1965	43.17
1966	42.94
1967	43.27
1968	44.35
1969	47.07
1970	58
1971	53.45
1972	62.93
1973	66.28
1974	88.3
1975	89
1976	86.66
1977	96.32
1978	93.09
1979	122.9
1980	133
1981	135.8
1982	144.5
1983	153
1984	114.3
1985	99
1986	117
1987	109
1988	102
1989	146.4
1990	161
1991	153.5
1992	186.5
1993	160
1994	149
1995	166.5
1996	136
1997	146.5
1998	171
1999	171.5
2000	156