Year	Kilotonnes
1850	0.00026
1851	0.00026
1852	0.00051
1853	0.00077
1854	0.00103
1855	0.00129
1856	0.00154
1857	0.0018
1858	0.00206
1859	0.00232
1860	0.00258
1861	0.00513
1862	0.00767
1863	0.01022
1864	0.01277
1865	0.01532
1866	0.01787
1867	0.02041
1868	0.02296
1869	0.02551
1870	0.02806
1871	0.03061
1872	0.03326
1873	0.03592
1874	0.03857
1875	0.04123
1876	0.04388
1877	0.04654
1878	0.04919
1879	0.05185
1880	0.0545
1881	0.06172
1882	0.05754
1883	0.05791
1884	0.05829
1885	0.06414
1886	0.06999
1887	0.07584
1888	0.08195
1889	0.0911
1890	0.0963
1891	0.08113
1892	0.1047
1893	0.09143
1894	0.1137
1895	0.1003
1896	0.1129
1897	0.1272
1898	0.1315
1899	0.1326
1900	0.1585
1901	0.1726
1902	0.09099
1903	0.09962
1904	0.1183
1905	0.1285
1906	0.1256
1907	0.136
1908	0.1784
1909	0.1635
1910	0.1951
1911	0.1695
1912	0.1942
1913	0.222
1914	0.2399
1915	0.2743
1916	0.3017
1917	0.2591
1918	0.2782
1919	0.3043
1920	0.3194
1921	0.4381
1922	0.4516
1923	0.5533
1924	0.5839
1925	0.5786
1926	0.5681
1927	0.6212
1928	0.6446
1929	0.7251
1930	0.7894
1931	0.6507
1932	0.5425
1933	0.6547
1934	0.7901
1935	0.8468
1936	0.8782
1937	1.119
1938	1.075
1939	1.145
1940	1.065
1941	1.098
1942	1.119
1943	1.123
1944	1.091
1945	1.082
1946	1.048
1947	1.107
1948	1.289
1949	1.334
1950	1.394
1951	0.7097
1952	0.9856
1953	1.62
1954	2.493
1955	3.311
1956	4.664
1957	5.078
1958	5.458
1959	5.97
1960	6.588
1961	6.936
1962	6.251
1963	10.84
1964	35.22
1965	39.61
1966	35.22
1967	37.15
1968	35.45
1969	34.97
1970	37.87
1971	41.42
1972	38.83
1973	41.05
1974	44.93
1975	42.45
1976	37.24
1977	40.16
1978	40
1979	41.07
1980	46.03
1981	43.91
1982	37.06
1983	32.04
1984	32.4
1985	31.38
1986	31.43
1987	32.06
1988	31.21
1989	31.61
1990	31.72
1991	32.15
1992	33.48
1993	33.25
1994	34.18
1995	30.9
1996	30.54
1997	33.86
1998	38.03
1999	40.14
2000	44.3