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13 87 13 88 13 89 13 90 13 91 13 92 13 93 13 94 13 95 13 96 13 97 13 98 13 99 14 00 14 01 14 02 14 03 14 04 14 05 14 06 14 07 14 08 14 09 14 10 14 11 14 12 14 13 14 14 14 15 14 16 14 17 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961

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