-98.77% is the change from 648 to 8
Calculation steps:
[( 8 - 648 ) ÷ 648] x 100 = -98.77%
Formula
Percentage change = [(8 - 648) / 648] x 100
Subtract the new number by the original number
8 - 648 = -640
-640 ÷ 648 = -0.9876543209876543
-0.9876543209876543 x 100 = -98.77%