-19.71% is the change from 817 to 656
Calculation steps:
[( 656 - 817 ) ÷ 817] x 100 = -19.71%
Formula
Percentage change = [(656 - 817) / 817] x 100
Subtract the new number by the original number
656 - 817 = -161
-161 ÷ 817 = -0.19706242350061198
-0.19706242350061198 x 100 = -19.71%