at a rate (割合で): The population is growing at a rate of 2% per year. (人口は毎年2%の割合で増加しています。) - 試験に出る! 英単語検索辞書

at a rate (割合で): The population is growing at a rate of 2% per year. (人口は毎年2%の割合で増加しています。)

The population is growing at a rate of 2% per year.