-83.75% is the change from 831 to 135
Calculation steps:
[( 135 - 831 ) ÷ 831] x 100 = -83.75%
Formula
Percentage change = [(135 - 831) / 831] x 100
Subtract the new number by the original number
135 - 831 = -696
-696 ÷ 831 = -0.8375451263537906
-0.8375451263537906 x 100 = -83.75%