-82.3% is the change from 514 to 91
Calculation steps:
[( 91 - 514 ) ÷ 514] x 100 = -82.3%
Formula
Percentage change = [(91 - 514) / 514] x 100
Subtract the new number by the original number
91 - 514 = -423
-423 ÷ 514 = -0.8229571984435797
-0.8229571984435797 x 100 = -82.3%