-98.79% is the change from 663 to 8
Calculation steps:
[( 8 - 663 ) ÷ 663] x 100 = -98.79%
Formula
Percentage change = [(8 - 663) / 663] x 100
Subtract the new number by the original number
8 - 663 = -655
-655 ÷ 663 = -0.9879336349924586
-0.9879336349924586 x 100 = -98.79%