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Table 12_7Table 12.7Determinants of U.S. Domestic Price of Copper, 1951-1980YEAR = YearC = Twelve-Month AverageU.S. Domestic Price of Copper, Cents Per PoundG = Annual Gross National Product, Billions of $I = Twelve-Month AverageIndex of Industrial ProductionL = Twelve-Month AverageLondonMetal Exchange Price of Copper, Pounds SterlingH = Number of Housing Starts perYear, Thousands ofUnitsA = Twelve-Month AveragePrice of Aluminum, Cents Per PoundYEARCGILHA195121.89330.245.1220.4149119195222.29347.250.9259.5150419.41195319.63366.153.3256.3143820.93195422.85366.353.6249.3155121.78195533.77399.354.6352.3164623.68195639.18420.761.1329.1134926.01195730.5844261.9219.6122427.52195826.344757.9234.8138226.89195930.748364.8237.41553.726.85196032.150666.2245.81296.127.23196130523.366.7229.2136525.46196230.8563.872.2233.91492.523.88196330.8594.776.5234.21634.922.62196432.6635.781.7347156123.72196535.4688.189.8468.11509.724.5196636.675397.85551195.824.5196738.6796.31004181321.924.98196842.2868.5106.3525.21545.425.58196947.9935.5111.1620.71499.527.18197058.2982.4107.8588.6146928.721971521063.4109.6444.42084.529197251.21171.1119.7427.82378.526.67197359.51306.6129.8727.12057.525.33197477.31412.9129.3877.61352.534.06197564.21528.8117.8556.61171.439.79197669.61700.1129.8780.61547.644.49197766.81887.2137.1750.71989.851.23197866.52127.6145.2709.82023.354.42197998.32628.8152.5935.71749.261.011980101.42633.1147.1940.91298.570.87