-89.36% is the change from 855 to 91
Calculation steps:
[( 91 - 855 ) ÷ 855] x 100 = -89.36%
Formula
Percentage change = [(91 - 855) / 855] x 100
Subtract the new number by the original number
91 - 855 = -764
-764 ÷ 855 = -0.8935672514619883
-0.8935672514619883 x 100 = -89.36%