-17.57% is the change from 831 to 685
Calculation steps:
[( 685 - 831 ) ÷ 831] x 100 = -17.57%
Formula
Percentage change = [(685 - 831) / 831] x 100
Subtract the new number by the original number
685 - 831 = -146
-146 ÷ 831 = -0.17569193742478942
-0.17569193742478942 x 100 = -17.57%