-83.11% is the change from 823 to 139
Calculation steps:
[( 139 - 823 ) ÷ 823] x 100 = -83.11%
Formula
Percentage change = [(139 - 823) / 823] x 100
Subtract the new number by the original number
139 - 823 = -684
-684 ÷ 823 = -0.8311057108140948
-0.8311057108140948 x 100 = -83.11%