-7.58% is the change from 831 to 768
Calculation steps:
[( 768 - 831 ) ÷ 831] x 100 = -7.58%
Formula
Percentage change = [(768 - 831) / 831] x 100
Subtract the new number by the original number
768 - 831 = -63
-63 ÷ 831 = -0.07581227436823104
-0.07581227436823104 x 100 = -7.58%