-1.66% is the change from 845 to 831
Calculation steps:
[( 831 - 845 ) ÷ 845] x 100 = -1.66%
Formula
Percentage change = [(831 - 845) / 845] x 100
Subtract the new number by the original number
831 - 845 = -14
-14 ÷ 845 = -0.016568047337278107
-0.016568047337278107 x 100 = -1.66%