Year	Kilotonnes
1850	0.03372
1851	0.02249
1852	0.04231
1853	0.03809
1854	0.04722
1855	0.04567
1856	0.06282
1857	0.07196
1858	0.07575
1859	0.07153
1860	0.102
1861	0.1005
1862	0.1122
1863	0.09998
1864	0.1278
1865	0.1262
1866	0.1059
1867	0.1337
1868	0.1294
1869	0.1572
1870	0.1396
1871	0.1273
1872	0.1551
1873	0.1376
1874	0.1549
1875	0.1562
1876	0.168
1877	0.1478
1878	0.1596
1879	0.1554
1880	0.1406
1881	0.1421
1882	0.1564
1883	0.1165
1884	0.1546
1885	0.1428
1886	0.1333
1887	0.1132
1888	0.1381
1889	0.1105
1890	0.1209
1891	0.1127
1892	0.1284
1893	0.1428
1894	0.1487
1895	0.1504
1896	0.1524
1897	0.1534
1898	0.1853
1899	0.2025
1900	0.2207
1901	0.2888
1902	0.2973
1903	0.3388
1904	0.3558
1905	0.3972
1906	0.3952
1907	0.4288
1908	0.4722
1909	0.5136
1910	0.525
1911	0.6223
1912	0.6193
1913	0.5565
1914	0.5513
1915	0.6807
1916	0.824
1917	0.9936
1918	1.106
1919	0.9285
1920	1
1921	0.8286
1922	0.9814
1923	1.258
1924	1.253
1925	1.36
1926	1.476
1927	1.621
1928	1.941
1929	2.082
1930	1.815
1931	1.629
1932	1.119
1933	1.349
1934	1.743
1935	1.824
1936	1.862
1937	2.529
1938	2.487
1939	2.453
1940	2.56
1941	2.917
1942	2.713
1943	2.995
1944	3.132
1945	3.296
1946	3.728
1947	3.483
1948	3.616
1949	3.74
1950	4.771
1951	5.287
1952	5.155
1953	5.079
1954	5.166
1955	5.539
1956	5.743
1957	5.852
1958	5.67
1959	5.81
1960	28.68
1961	33.95
1962	40.07
1963	46.38
1964	62.62
1965	64.06
1966	64.75
1967	60.69
1968	76.35
1969	34.04
1970	31.61
1971	38.54
1972	29.57
1973	30.29
1974	34.79
1975	32.62
1976	40.46
1977	39.41
1978	28.08
1979	18.3
1980	24.76
1981	26.94
1982	21.28
1983	17.12
1984	14.25
1985	15
1986	14.99
1987	16.04
1988	17.6
1989	16.22
1990	14.98
1991	15.16
1992	15.28
1993	15.19
1994	15.58
1995	14.35
1996	14.88
1997	17.52
1998	18.62
1999	17.34
2000	18.09