-52.23% is the change from 831 to 397
Calculation steps:
[( 397 - 831 ) ÷ 831] x 100 = -52.23%
Formula
Percentage change = [(397 - 831) / 831] x 100
Subtract the new number by the original number
397 - 831 = -434
-434 ÷ 831 = -0.5222623345367028
-0.5222623345367028 x 100 = -52.23%