-90.35% is the change from 663 to 64
Calculation steps:
[( 64 - 663 ) ÷ 663] x 100 = -90.35%
Formula
Percentage change = [(64 - 663) / 663] x 100
Subtract the new number by the original number
64 - 663 = -599
-599 ÷ 663 = -0.9034690799396682
-0.9034690799396682 x 100 = -90.35%