-83.74% is the change from 529 to 86
Calculation steps:
[( 86 - 529 ) ÷ 529] x 100 = -83.74%
Formula
Percentage change = [(86 - 529) / 529] x 100
Subtract the new number by the original number
86 - 529 = -443
-443 ÷ 529 = -0.8374291115311909
-0.8374291115311909 x 100 = -83.74%