（米調査会社は15年から年率15％ずつ増え、5年で2倍に拡大）

（米調査会社は15年から年率15％ずつ増え、5年で2倍に拡大）

Results (English) 1:

(Stretches to double in five years, U.S. research firm from 15 years to grow at 15% per annum)

Results (English) 2:

(US research company has increased by 15% per annum from 15 years, expanded to 2-fold in five years)

Results (English) 3:

Double expansion, U.S. research firm, has increased by 15 percent a year from 15 years.