-89.47% is the change from 817 to 86
Calculation steps:
[( 86 - 817 ) ÷ 817] x 100 = -89.47%
Formula
Percentage change = [(86 - 817) / 817] x 100
Subtract the new number by the original number
86 - 817 = -731
-731 ÷ 817 = -0.8947368421052632
-0.8947368421052632 x 100 = -89.47%