Correct or improve the translation of the following English sentences.原文：By the end of the 1980s, output per person in manufacturing was half as much again as it had been at the start of the decade. 译文：到二十世纪八十年代，制造业的人均产量是八十年代初的一半。

Correct or improve the translation of the following English sentences.原文：By the end of the 1980s, output per person in manufacturing was half as much again as it had been at the start of the decade. 译文：到二十世纪八十年代，制造业的人均产量是八十年代初的一半。

到二十世纪八十年代末，制造业的人均产量是八十年代初的一倍半。