-6.38% is the change from 831 to 778
Calculation steps:
[( 778 - 831 ) ÷ 831] x 100 = -6.38%
Formula
Percentage change = [(778 - 831) / 831] x 100
Subtract the new number by the original number
778 - 831 = -53
-53 ÷ 831 = -0.06377858002406739
-0.06377858002406739 x 100 = -6.38%