-23.53% is the change from 663 to 507
Calculation steps:
[( 507 - 663 ) ÷ 663] x 100 = -23.53%
Formula
Percentage change = [(507 - 663) / 663] x 100
Subtract the new number by the original number
507 - 663 = -156
-156 ÷ 663 = -0.23529411764705882
-0.23529411764705882 x 100 = -23.53%