-9.1% is the change from 989 to 899
Calculation steps:
[( 899 - 989 ) ÷ 989] x 100 = -9.1%
Formula
Percentage change = [(899 - 989) / 989] x 100
Subtract the new number by the original number
899 - 989 = -90
-90 ÷ 989 = -0.0910010111223458
-0.0910010111223458 x 100 = -9.1%