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13 56 13 57 13 58 13 59 13 60 13 61 13 62 13 63 13 64 13 65 13 66 13 67 13 68 13 69 13 70 13 71 13 72 13 73 13 74 13 75 13 76 13 77 13 78 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968

= Free Coordinate    = Occupied(Single Region)     = Occupied (Var Region)     = Center of the grid