-9.19% is the change from 990 to 899
Calculation steps:
[( 899 - 990 ) ÷ 990] x 100 = -9.19%
Formula
Percentage change = [(899 - 990) / 990] x 100
Subtract the new number by the original number
899 - 990 = -91
-91 ÷ 990 = -0.09191919191919191
-0.09191919191919191 x 100 = -9.19%