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Rating graphs 1850-2002: 30-year ranges

1850-1880



1860-1890



1870-1900



1880-1910



1890-1920



1900-1930



1910-1940



1920-1950



1930-1960



1940-1970



1950-1980



1960-1990



1970-2002



1980-2002

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