-20.87% is the change from 829 to 656
Calculation steps:
[( 656 - 829 ) ÷ 829] x 100 = -20.87%
Formula
Percentage change = [(656 - 829) / 829] x 100
Subtract the new number by the original number
656 - 829 = -173
-173 ÷ 829 = -0.20868516284680338
-0.20868516284680338 x 100 = -20.87%