-98.94% is the change from 663 to 7
Calculation steps:
[( 7 - 663 ) ÷ 663] x 100 = -98.94%
Formula
Percentage change = [(7 - 663) / 663] x 100
Subtract the new number by the original number
7 - 663 = -656
-656 ÷ 663 = -0.9894419306184012
-0.9894419306184012 x 100 = -98.94%