-90.5% is the change from 663 to 63
Calculation steps:
[( 63 - 663 ) ÷ 663] x 100 = -90.5%
Formula
Percentage change = [(63 - 663) / 663] x 100
Subtract the new number by the original number
63 - 663 = -600
-600 ÷ 663 = -0.9049773755656109
-0.9049773755656109 x 100 = -90.5%