-19.67% is the change from 661 to 531
Calculation steps:
[( 531 - 661 ) ÷ 661] x 100 = -19.67%
Formula
Percentage change = [(531 - 661) / 661] x 100
Subtract the new number by the original number
531 - 661 = -130
-130 ÷ 661 = -0.19667170953101362
-0.19667170953101362 x 100 = -19.67%