-85.45% is the change from 591 to 86
Calculation steps:
[( 86 - 591 ) ÷ 591] x 100 = -85.45%
Formula
Percentage change = [(86 - 591) / 591] x 100
Subtract the new number by the original number
86 - 591 = -505
-505 ÷ 591 = -0.8544839255499154
-0.8544839255499154 x 100 = -85.45%