37.8% is the change from 664 to 915
Calculation steps:
[( 915 - 664 ) ÷ 664] x 100 = 37.8%
Formula
Percentage change = [(915 - 664) / 664] x 100
Subtract the new number by the original number
915 - 664 = 251
251 ÷ 664 = 0.37801204819277107
0.37801204819277107 x 100 = 37.8%