-21.18% is the change from 831 to 655
Calculation steps:
[( 655 - 831 ) ÷ 831] x 100 = -21.18%
Formula
Percentage change = [(655 - 831) / 831] x 100
Subtract the new number by the original number
655 - 831 = -176
-176 ÷ 831 = -0.21179302045728038
-0.21179302045728038 x 100 = -21.18%