-19.82% is the change from 661 to 530
Calculation steps:
[( 530 - 661 ) ÷ 661] x 100 = -19.82%
Formula
Percentage change = [(530 - 661) / 661] x 100
Subtract the new number by the original number
530 - 661 = -131
-131 ÷ 661 = -0.19818456883509833
-0.19818456883509833 x 100 = -19.82%