-9.38% is the change from 917 to 831
Calculation steps:
[( 831 - 917 ) ÷ 917] x 100 = -9.38%
Formula
Percentage change = [(831 - 917) / 917] x 100
Subtract the new number by the original number
831 - 917 = -86
-86 ÷ 917 = -0.09378407851690294
-0.09378407851690294 x 100 = -9.38%