Year	Tonnes
1945	3.667
1946	95477.679
1947	92162.711
1948	100519.804
1949	117285.328
1950	163570.202
1951	179206.29
1952	189543.563
1953	209950.418
1954	220841.408
1955	237995.634
1956	244042.517
1957	252021.909
1958	256660.664
1959	259014.878
1960	270705.274
1961	284680.211
1962	298207.774
1963	306854.56
1964	316293.418
1965	310426.218
1966	312208.38
1967	303634.934
1968	307694.303
1969	321625.236
1970	279876.441
1971	284896.564
1972	282461.676
1973	286572.383
1974	287005.089
1975	288757.915
1976	296014.908
1977	303895.291
1978	306891.23
1979	312186.378
1980	316286.084
1981	317268.84
1982	318222.26
1983	316293.418
1984	326029.303
1985	341859.742
1986	345306.722
1987	344954.69
1988	337613.356
1989	334063.7
1990	310070.519