-82.19% is the change from 831 to 148
Calculation steps:
[( 148 - 831 ) ÷ 831] x 100 = -82.19%
Formula
Percentage change = [(148 - 831) / 831] x 100
Subtract the new number by the original number
148 - 831 = -683
-683 ÷ 831 = -0.8219013237063778
-0.8219013237063778 x 100 = -82.19%