-85.15% is the change from 613 to 91
Calculation steps:
[( 91 - 613 ) ÷ 613] x 100 = -85.15%
Formula
Percentage change = [(91 - 613) / 613] x 100
Subtract the new number by the original number
91 - 613 = -522
-522 ÷ 613 = -0.8515497553017944
-0.8515497553017944 x 100 = -85.15%