Year	Tonnes
1880	0
1885	29.336
1890	88.008
1891	102.676
1892	113.677
1893	201.685
1894	385.035
1895	385.035
1896	429.039
1897	333.697
1898	506.046
1899	590.387
1900	799.406
1901	872.746
1902	817.741
1903	887.414
1904	946.086
1905	1026.76
1906	1228.445
1907	1250.447
1908	1345.789
1909	1382.459
1910	1367.791
1911	1481.468
1912	1518.138
1913	4169.379
1919	2988.605
1920	3967.694
1921	4224.384
1922	6138.558
1923	6695.942
1924	6864.624
1925	7535.685
1926	7337.667
1927	8291.087
1928	9416.856
1929	10271.267
1930	9666.212
1931	8932.812
1932	8144.407
1933	7535.685
1934	7843.713
1935	8210.413
1936	8096.736
1937	9020.82
1938	8544.11
1939	8965.815
1940	10311.604
1943	377.701
1944	91.675
1945	5210.807
1946	10296.936
1947	14326.969
1948	16149.468
1949	18448.677
1950	17722.611
1951	16776.525
1952	16846.198
1953	16728.854
1954	19955.814
1955	22852.744
1956	26127.375
1957	28371.579
1958	27960.875
1959	32053.247
1960	35012.516
1961	36699.336
1962	37660.09
1963	41895.475
1964	47465.648
1965	48837.106
1966	48393.399
1967	48881.11
1968	52280.419
1969	54205.594
1970	70835.439
1971	76343.273
1972	71554.171
1973	85477.77
1974	85851.804
1975	89581.143
1976	92459.738
1977	89914.84
1978	100479.467
1979	109291.268
1980	107468.769
1981	116958.965
1982	107450.434
1983	115704.851
1984	122019.425
1985	124468.981
1986	129991.483
1987	129173.742
1988	133687.819
1989	133394.459
1990	133288.116
1991	94278.57