Year	Tonnes
1950	25669
1951	51338
1952	80674
1953	110010
1954	150347
1955	194351
1956	231021
1957	256690
1958	322696
1959	396036
1960	454708
1961	528048
1962	597721
1963	678395
1964	777404
1965	880080
1966	979089
1967	1081765
1968	1210110
1969	1345789
1970	1514471
1971	1730824
1972	1983847
1973	2310210
1974	2680577
1975	3285632
1976	4015365
1977	4880777
1978	5830530
1979	6875625
1980	8071067
1981	9431524
1982	11389702
1983	13879595
1984	16827863
1985	19985150
1986	23138770
1987	26494075
1988	29900718
1989	33399036
1990	37165045