-82.77% is the change from 528 to 91
Calculation steps:
[( 91 - 528 ) ÷ 528] x 100 = -82.77%
Formula
Percentage change = [(91 - 528) / 528] x 100
Subtract the new number by the original number
91 - 528 = -437
-437 ÷ 528 = -0.8276515151515151
-0.8276515151515151 x 100 = -82.77%