-18.28% is the change from 990 to 809
Calculation steps:
[( 809 - 990 ) ÷ 990] x 100 = -18.28%
Formula
Percentage change = [(809 - 990) / 990] x 100
Subtract the new number by the original number
809 - 990 = -181
-181 ÷ 990 = -0.18282828282828284
-0.18282828282828284 x 100 = -18.28%