-88.86% is the change from 817 to 91
Calculation steps:
[( 91 - 817 ) ÷ 817] x 100 = -88.86%
Formula
Percentage change = [(91 - 817) / 817] x 100
Subtract the new number by the original number
91 - 817 = -726
-726 ÷ 817 = -0.8886168910648715
-0.8886168910648715 x 100 = -88.86%