-82.36% is the change from 516 to 91
Calculation steps:
[( 91 - 516 ) ÷ 516] x 100 = -82.36%
Formula
Percentage change = [(91 - 516) / 516] x 100
Subtract the new number by the original number
91 - 516 = -425
-425 ÷ 516 = -0.8236434108527132
-0.8236434108527132 x 100 = -82.36%