-85.59% is the change from 597 to 86
Calculation steps:
[( 86 - 597 ) ÷ 597] x 100 = -85.59%
Formula
Percentage change = [(86 - 597) / 597] x 100
Subtract the new number by the original number
86 - 597 = -511
-511 ÷ 597 = -0.8559463986599665
-0.8559463986599665 x 100 = -85.59%