-20.12% is the change from 661 to 528
Calculation steps:
[( 528 - 661 ) ÷ 661] x 100 = -20.12%
Formula
Percentage change = [(528 - 661) / 661] x 100
Subtract the new number by the original number
528 - 661 = -133
-133 ÷ 661 = -0.20121028744326777
-0.20121028744326777 x 100 = -20.12%