-20.73% is the change from 656 to 520
Calculation steps:
[( 520 - 656 ) ÷ 656] x 100 = -20.73%
Formula
Percentage change = [(520 - 656) / 656] x 100
Subtract the new number by the original number
520 - 656 = -136
-136 ÷ 656 = -0.2073170731707317
-0.2073170731707317 x 100 = -20.73%