-87.8% is the change from 656 to 80
Calculation steps:
[( 80 - 656 ) ÷ 656] x 100 = -87.8%
Formula
Percentage change = [(80 - 656) / 656] x 100
Subtract the new number by the original number
80 - 656 = -576
-576 ÷ 656 = -0.8780487804878049
-0.8780487804878049 x 100 = -87.8%