-62.45% is the change from 831 to 312
Calculation steps:
[( 312 - 831 ) ÷ 831] x 100 = -62.45%
Formula
Percentage change = [(312 - 831) / 831] x 100
Subtract the new number by the original number
312 - 831 = -519
-519 ÷ 831 = -0.6245487364620939
-0.6245487364620939 x 100 = -62.45%