7.2 The data below show consumption of margarine (in ounces per person per week) and its real price, for the UK. Year Consumption Price Year Consumption Price 1970 2.86 125.6 1980 3.83 104.2 1971 3.15 132.9 1981 4.11 95.5 1972 3.52 126.0 1982 4.33 88.1 1973 3.03 119.6 1983 4.08 88.9 1974 2.60 138.8 1984 4.08 97.3 1975 2.60 141.0 1985 3.76 100.0 1976 3.06 122.3 1986 4.10 86.7 1977 3.48 132.7 1987 3.98 79.8 1978 3.54 126.7 1988 3.78 79.9 1979 3.63 115.7