-98.63% is the change from 656 to 9
Calculation steps:
[( 9 - 656 ) ÷ 656] x 100 = -98.63%
Formula
Percentage change = [(9 - 656) / 656] x 100
Subtract the new number by the original number
9 - 656 = -647
-647 ÷ 656 = -0.9862804878048781
-0.9862804878048781 x 100 = -98.63%