[经] indexes of prices paid by farmers

nóng hù gòu huò jià gé zhǐ shù ㄋㄨㄥˊ ㄏㄨˋ ㄍㄡˋ ㄏㄨㄛˋ ㄐㄧㄚˋ ㄍㄜˊ ㄓˇ ㄕㄨˋ