-98.62% is the change from 651 to 9
Calculation steps:
[( 9 - 651 ) ÷ 651] x 100 = -98.62%
Formula
Percentage change = [(9 - 651) / 651] x 100
Subtract the new number by the original number
9 - 651 = -642
-642 ÷ 651 = -0.9861751152073732
-0.9861751152073732 x 100 = -98.62%