-18.53% is the change from 831 to 677
Calculation steps:
[( 677 - 831 ) ÷ 831] x 100 = -18.53%
Formula
Percentage change = [(677 - 831) / 831] x 100
Subtract the new number by the original number
677 - 831 = -154
-154 ÷ 831 = -0.18531889290012032
-0.18531889290012032 x 100 = -18.53%