Year	Tonnes
1945	114351.728
1946	175143.254
1947	225769.856
1948	277632.237
1949	315255.657
1950	347580.262
1951	398188.529
1952	421998.36
1953	414125.311
1954	439508.285
1955	486181.861
1956	522866.529
1957	526614.203
1958	500431.823
1959	497509.224
1960	544032.453
1961	550974.084
1962	585821.585
1963	639557.803
1964	653576.744
1965	650624.809
1966	640159.191
1967	633518.254
1968	678068.637
1969	731408.819
1970	747173.252
1971	753608.837
1972	760543.134
1973	800931.472
1974	777594.684
1975	715666.388
1976	797150.795
1977	751170.282
1978	775013.116
1979	808782.519
1980	786934.533
1981	734419.426
1982	700734.364
1983	698743.183
1984	710734.273
1985	705747.153
1986	705912.168
1987	691324.842
1988	695497.888
1989	683121.763
1990	703660.63