-7.34% is the change from 831 to 770
Calculation steps:
[( 770 - 831 ) ÷ 831] x 100 = -7.34%
Formula
Percentage change = [(770 - 831) / 831] x 100
Subtract the new number by the original number
770 - 831 = -61
-61 ÷ 831 = -0.07340553549939831
-0.07340553549939831 x 100 = -7.34%