year metal GDP
1960 229 61.2
1961 367 70
1962 301 74.9
1963 352 82.8
1964 457 93.6
1965 427 98.5
1966 485 108.8
1967 616 120.1
1968 695 135.1
1969 806 152.5
1970 815 165.8
1971 826 173
1972 951 189.9
1973 1202 202.6
1974 881 199.7
1975 827 205
1976 1050 214.9
1977 1127 226.3
1978 1241 238.1
1979 1330 250.7
1980 1158 261.4
1981 1254 271
1982 1243 279.3
1983 1216 288.4
1984 1368 303
1985 1231 317.3
1986 1219 325.7
1987 1284 340.3
1988 1355 359.5