-98.77% is the change from 649 to 8
Calculation steps:
[( 8 - 649 ) ÷ 649] x 100 = -98.77%
Formula
Percentage change = [(8 - 649) / 649] x 100
Subtract the new number by the original number
8 - 649 = -641
-641 ÷ 649 = -0.987673343605547
-0.987673343605547 x 100 = -98.77%