-37.67% is the change from 831 to 518
Calculation steps:
[( 518 - 831 ) ÷ 831] x 100 = -37.67%
Formula
Percentage change = [(518 - 831) / 831] x 100
Subtract the new number by the original number
518 - 831 = -313
-313 ÷ 831 = -0.3766546329723225
-0.3766546329723225 x 100 = -37.67%