-19.91% is the change from 663 to 531
Calculation steps:
[( 531 - 663 ) ÷ 663] x 100 = -19.91%
Formula
Percentage change = [(531 - 663) / 663] x 100
Subtract the new number by the original number
531 - 663 = -132
-132 ÷ 663 = -0.19909502262443438
-0.19909502262443438 x 100 = -19.91%