ratings (e.g. of a television program), audience rating, viewing rate
伸び率【のびりつ】
growth rate, coefficient of extension
打率【だりつ】
batting average
利率【りりつ】
interest rate
倍率【ばいりつ】
magnification, leverage, amplification, scaling factor, scale factor, competitiveness rating (e.g. for university entrance), applicant-to-acceptance ratio