-19.55% is the change from 660 to 531
Calculation steps:
[( 531 - 660 ) ÷ 660] x 100 = -19.55%
Formula
Percentage change = [(531 - 660) / 660] x 100
Subtract the new number by the original number
531 - 660 = -129
-129 ÷ 660 = -0.19545454545454546
-0.19545454545454546 x 100 = -19.55%