-9.48% is the change from 918 to 831
Calculation steps:
[( 831 - 918 ) ÷ 918] x 100 = -9.48%
Formula
Percentage change = [(831 - 918) / 918] x 100
Subtract the new number by the original number
831 - 918 = -87
-87 ÷ 918 = -0.09477124183006536
-0.09477124183006536 x 100 = -9.48%