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1977 2.10045 1978 2.01907 1979 1.98247 1980 2.0099 1981 2.10175 1982 2.18328 1983 2.16422 1984 2.02972 1985 1.84027 1986 1.64231 1987 1.41287 1988 1.12532 1989 1.06866 1990 1.84749