-83.56% is the change from 523 to 86
Calculation steps:
[( 86 - 523 ) ÷ 523] x 100 = -83.56%
Formula
Percentage change = [(86 - 523) / 523] x 100
Subtract the new number by the original number
86 - 523 = -437
-437 ÷ 523 = -0.8355640535372849
-0.8355640535372849 x 100 = -83.56%