-98.78% is the change from 657 to 8
Calculation steps:
[( 8 - 657 ) ÷ 657] x 100 = -98.78%
Formula
Percentage change = [(8 - 657) / 657] x 100
Subtract the new number by the original number
8 - 657 = -649
-649 ÷ 657 = -0.9878234398782344
-0.9878234398782344 x 100 = -98.78%