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58 7 58 8 58 9 59 0 59 1 59 2 59 3 59 4 59 5 59 6 59 7 59 8 59 9 60 0 60 1 60 2 60 3 60 4 60 5 60 6 60 7 60 8 60 9 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977

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