-23.35% is the change from 831 to 637
Calculation steps:
[( 637 - 831 ) ÷ 831] x 100 = -23.35%
Formula
Percentage change = [(637 - 831) / 831] x 100
Subtract the new number by the original number
637 - 831 = -194
-194 ÷ 831 = -0.23345367027677497
-0.23345367027677497 x 100 = -23.35%