-20.6% is the change from 665 to 528
Calculation steps:
[( 528 - 665 ) ÷ 665] x 100 = -20.6%
Formula
Percentage change = [(528 - 665) / 665] x 100
Subtract the new number by the original number
528 - 665 = -137
-137 ÷ 665 = -0.20601503759398496
-0.20601503759398496 x 100 = -20.6%