19.14% is the change from 815 to 971
Calculation steps:
[( 971 - 815 ) ÷ 815] x 100 = 19.14%
Formula
Percentage change = [(971 - 815) / 815] x 100
Subtract the new number by the original number
971 - 815 = 156
156 ÷ 815 = 0.19141104294478528
0.19141104294478528 x 100 = 19.14%