-81.09% is the change from 439 to 83
Calculation steps:
[( 83 - 439 ) ÷ 439] x 100 = -81.09%
Formula
Percentage change = [(83 - 439) / 439] x 100
Subtract the new number by the original number
83 - 439 = -356
-356 ÷ 439 = -0.8109339407744874
-0.8109339407744874 x 100 = -81.09%
Example