-81.55% is the change from 439 to 81
Calculation steps:
[( 81 - 439 ) ÷ 439] x 100 = -81.55%
Formula
Percentage change = [(81 - 439) / 439] x 100
Subtract the new number by the original number
81 - 439 = -358
-358 ÷ 439 = -0.8154897494305239
-0.8154897494305239 x 100 = -81.55%