-87.55% is the change from 731 to 91
Calculation steps:
[( 91 - 731 ) ÷ 731] x 100 = -87.55%
Formula
Percentage change = [(91 - 731) / 731] x 100
Subtract the new number by the original number
91 - 731 = -640
-640 ÷ 731 = -0.8755129958960328
-0.8755129958960328 x 100 = -87.55%