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15 00 15 01 15 02 15 03 15 04 15 05 15 06 15 07 15 08 15 09 15 10 15 11 15 12 15 13 15 14 15 15 15 16 15 17 15 18 15 19 15 20 15 21 15 22 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967

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