-82.7% is the change from 526 to 91
Calculation steps:
[( 91 - 526 ) ÷ 526] x 100 = -82.7%
Formula
Percentage change = [(91 - 526) / 526] x 100
Subtract the new number by the original number
91 - 526 = -435
-435 ÷ 526 = -0.8269961977186312
-0.8269961977186312 x 100 = -82.7%
Example