-63.06% is the change from 831 to 307
Calculation steps:
[( 307 - 831 ) ÷ 831] x 100 = -63.06%
Formula
Percentage change = [(307 - 831) / 831] x 100
Subtract the new number by the original number
307 - 831 = -524
-524 ÷ 831 = -0.6305655836341757
-0.6305655836341757 x 100 = -63.06%