-20.94% is the change from 831 to 657
Calculation steps:
[( 657 - 831 ) ÷ 831] x 100 = -20.94%
Formula
Percentage change = [(657 - 831) / 831] x 100
Subtract the new number by the original number
657 - 831 = -174
-174 ÷ 831 = -0.20938628158844766
-0.20938628158844766 x 100 = -20.94%