Year	Tonnes
1860	267.691
1861	880.08
1862	1496.136
1863	2112.192
1864	2728.248
1865	3344.304
1866	3960.36
1867	4572.749
1868	5188.805
1869	5804.861
1870	6420.917
1871	7036.973
1872	7649.362
1873	8265.418
1874	8881.474
1875	9497.53
1876	16417.159
1877	17249.568
1878	18081.977
1879	19431.433
1880	20586.538
1881	21741.643
1882	22233.021
1883	23747.492
1884	24528.563
1885	25753.341
1886	27073.461
1887	28437.585
1888	30480.104
1889	32269.6
1890	34510.137
1891	35778.919
1892	36321.635
1893	37128.375
1894	38059.793
1895	39500.924
1896	40472.679
1897	42834.227
1898	43791.314
1899	44928.084
1900	44601.721
1901	46603.903
1902	47227.293
1903	48114.707
1904	48584.083
1905	50014.213
1906	52229.081
1907	54891.323
1908	55903.415
1909	55562.384
1910	54982.998
1911	55679.728
1912	59244.052
1913	61968.633
1914	56493.802
1915	56369.124
1916	59995.787
1917	56416.795
1918	48100.039
1919	45441.464
1920	45067.43
1921	43281.601
1922	38628.178
1923	40828.378
1924	50113.222
1925	47161.287
1926	47817.68
1927	51315.998
1928	54029.578
1929	60439.494
1930	53281.51
1931	49852.865
1932	43450.283
1933	39739.279
1934	39695.275
1935	40865.048
1936	44400.036
1937	53780.222
1938	61623.935
1939	67703.821
1940	76306.603
1941	76805.315
1942	82837.53
1943	91458.647
1944	87201.26
1945	46277.54
1946	57597.569
1947	65364.275
1948	70644.755
1949	74264.084
1950	76460.617
1951	81477.073
1952	87116.919
1953	90292.541
1954	96427.432
1955	100094.432
1956	107406.43
1957	112180.864
1958	122573.142
1959	122686.819
1960	130849.561
1961	142019.243
1962	151344.424
1963	159202.805
1964	165686.061
1965	161443.342
1966	160533.926
1967	160200.229
1968	167607.569
1969	177933.841
1970	204002.544
1971	214031.789
1972	216030.304
1973	216947.054
1974	219499.286
1975	229700.88
1976	238681.363
1977	245865.016
1978	248149.557
1979	241728.64
1980	244610.902
1981	241999.998
1982	239671.453
1983	240052.821
1984	248182.56
1985	244838.256
1986	246569.08
1987	244640.238
1988	240756.885
1989	232858.167
1990	217757.461
1991	200819.588