-15.98% is the change from 989 to 831
Calculation steps:
[( 831 - 989 ) ÷ 989] x 100 = -15.98%
Formula
Percentage change = [(831 - 989) / 989] x 100
Subtract the new number by the original number
831 - 989 = -158
-158 ÷ 989 = -0.1597573306370071
-0.1597573306370071 x 100 = -15.98%