g%DBWINUS0YEARN PCT_TERRACEN PCT_STREAMN PCT_QUARRYN  1960 89.50 10.50 1961 92.60 7.40 1962 94.40 5.60 1963 90.10 9.90 1964 88.40 11.60 1965 3.90 83.00 13.10 1966 3.70 83.10 13.20 1967 36.90 49.20 13.90 1968 72.20 14.00 13.80 1969 70.40 16.50 13.00 1970 66.60 20.20 13.20 1971 75.10 14.00 10.90 1972 78.10 11.30 10.60 1973 72.00 12.70 15.30 1974 74.10 12.70 13.20 1975 66.30 13.10 20.60 1976 66.60 13.20 20.20 1977 69.00 11.00 20.00 1981 43.00 20.42 36.58 1982 34.35 24.47 41.18 1983 45.59 21.52 32.90 1984 45.33 21.72 32.96 1985 45.01 27.30 27.69 1986 45.09 2.60 29.46 1987 49.88 17.71 32.41 1988 50.90 18.53 30.57 1989 53.18 14.48 32.34 1990 52.98 8.04 38.98