-84.97% is the change from 539 to 81
Calculation steps:
[( 81 - 539 ) ÷ 539] x 100 = -84.97%
Formula
Percentage change = [(81 - 539) / 539] x 100
Subtract the new number by the original number
81 - 539 = -458
-458 ÷ 539 = -0.849721706864564
-0.849721706864564 x 100 = -84.97%