| Copper prices in cents US$/lb | ||||||||
| years | current US$ cents | SDR/US$ | current SDRs cents | GDP deflators % change over previous year | GDP indices from 1952 | GDP dividers to 1990 | constant US$ values cents | constant SDR values cents |
| 1952 | 24.2 | 1.000 | 24.2 | 2.0 | 102.0 | 0.338 | 71.6 | 71.6 |
| 1953 | 28.8 | 1.000 | 28.8 | 3.8 | 105.8 | 0.351 | 82.1 | 82.1 |
| 1954 | 29.7 | 1.000 | 29.7 | 2.7 | 108.5 | 0.360 | 82.6 | 82.6 |
| 1955 | 37.5 | 1.000 | 37.5 | 2.7 | 111.2 | 0.369 | 101.7 | 101.7 |
| 1956 | 41.8 | 1.000 | 41.8 | 2.1 | 113.3 | 0.375 | 111.4 | 111.4 |
| 1957 | 29.6 | 1.000 | 29.6 | 1.8 | 115.1 | 0.381 | 77.5 | 77.5 |
| 1958 | 25.8 | 1.000 | 25.8 | 3.0 | 118.1 | 0.391 | 65.8 | 65.8 |
| 1959 | 31.2 | 1.000 | 31.2 | 3.0 | 121.1 | 0.401 | 77.7 | 77.7 |
| 1960 | 32.1 | 1.000 | 32.1 | 2.0 | 123.1 | 0.408 | 78.6 | 78.6 |
| 1961 | 29.9 | 1.000 | 29.9 | 2.3 | 125.4 | 0.416 | 72.0 | 72.0 |
| 1962 | 30.6 | 1.000 | 30.6 | 3.0 | 128.4 | 0.426 | 71.9 | 71.9 |
| 1963 | 30.6 | 1.000 | 30.6 | 2.8 | 131.2 | 0.435 | 70.4 | 70.4 |
| 1964 | 31.9 | 1.000 | 31.9 | 3.1 | 134.3 | 0.445 | 71.7 | 71.7 |
| 1965 | 35.0 | 1.000 | 35.0 | 3.4 | 137.7 | 0.456 | 76.7 | 76.7 |
| 1966 | 36.2 | 1.000 | 36.2 | 3.3 | 141.0 | 0.467 | 77.4 | 77.4 |
| 1967 | 38.2 | 1.000 | 38.2 | 3.3 | 144.3 | 0.478 | 79.9 | 79.9 |
| 1968 | 41.8 | 1.000 | 41.8 | 4.3 | 148.6 | 0.492 | 85.0 | 85.0 |
| 1969 | 47.5 | 1.000 | 47.5 | 4.8 | 153.4 | 0.508 | 93.5 | 93.5 |
| 1970 | 57.7 | 1.000 | 57.7 | 6.9 | 160.3 | 0.531 | 108.6 | 108.6 |
| 1971 | 51.4 | 0.997 | 51.3 | 6.0 | 166.3 | 0.551 | 93.3 | 93.0 |
| 1972 | 50.6 | 0.921 | 46.6 | 5.7 | 172.0 | 0.570 | 88.8 | 81.8 |
| 1973 | 58.9 | 0.839 | 49.4 | 8.1 | 180.1 | 0.597 | 98.6 | 82.7 |
| 1974 | 76.6 | 0.832 | 63.7 | 11.8 | 191.9 | 0.636 | 120.5 | 100.2 |
| 1975 | 63.5 | 0.824 | 52.3 | 10.1 | 202.0 | 0.669 | 94.9 | 78.2 |
| 1976 | 68.8 | 0.866 | 59.6 | 8.2 | 210.2 | 0.697 | 98.8 | 85.6 |
| 1977 | 65.8 | 0.857 | 56.4 | 7.9 | 218.1 | 0.723 | 91.0 | 78.0 |
| 1978 | 65.5 | 0.799 | 52.3 | 7.8 | 225.9 | 0.749 | 87.5 | 69.9 |
| 1979 | 92.3 | 0.774 | 71.5 | 8.1 | 234.0 | 0.775 | 119.1 | 92.2 |
| 1980 | 101.4 | 0.769 | 78.0 | 9.3 | 243.3 | 0.806 | 125.8 | 96.7 |
| 1981 | 84.0 | 0.848 | 71.3 | 9.0 | 252.3 | 0.836 | 100.5 | 85.2 |
| 1982 | 80.8 | 0.906 | 73.2 | 7.3 | 259.6 | 0.860 | 93.9 | 85.1 |
| 1983 | 79.0 | 0.935 | 73.9 | 5.5 | 265.1 | 0.879 | 89.9 | 84.1 |
| 1984 | 66.8 | 0.976 | 65.1 | 4.7 | 269.8 | 0.894 | 74.7 | 72.9 |
| 1985 | 65.6 | 0.985 | 64.6 | 3.9 | 273.7 | 0.907 | 72.3 | 71.2 |
| 1986 | 64.7 | 0.852 | 55.1 | 3.5 | 277.2 | 0.919 | 70.4 | 60.0 |
| 1987 | 81.1 | 0.773 | 62.7 | 2.9 | 280.1 | 0.928 | 87.4 | 67.6 |
| 1988 | 119.1 | 0.744 | 88.6 | 3.3 | 283.4 | 0.939 | 126.8 | 94.4 |
| 1989 | 129.2 | 0.780 | 100.8 | 4.0 | 287.4 | 0.952 | 135.6 | 105.8 |
| 1990 | 120.7 | 0.737 | 89.0 | 4.0 | 291.4 | 0.966 | 125.0 | 92.1 |
| 1991 | 106.1 | 0.731 | 77.5 | 4.4 | 295.8 | 0.980 | 108.2 | 79.1 |
| 1992 | 103.6 | 0.710 | 73.6 | 3.2 | 299.0 | 0.991 | 104.6 | 74.3 |
| 1993 | 86.9 | 0.716 | 62.2 | 2.8 | 301.7 | 1.000 | 86.9 | 62.2 |
| average | 60.5 | [1] | 52.3 | 91.7 | 82.1 | |||