-98.63% is the change from 657 to 9
Calculation steps:
[( 9 - 657 ) ÷ 657] x 100 = -98.63%
Formula
Percentage change = [(9 - 657) / 657] x 100
Subtract the new number by the original number
9 - 657 = -648
-648 ÷ 657 = -0.9863013698630136
-0.9863013698630136 x 100 = -98.63%