-20.96% is the change from 830 to 656
Calculation steps:
[( 656 - 830 ) ÷ 830] x 100 = -20.96%
Formula
Percentage change = [(656 - 830) / 830] x 100
Subtract the new number by the original number
656 - 830 = -174
-174 ÷ 830 = -0.20963855421686747
-0.20963855421686747 x 100 = -20.96%