-17.88% is the change from 990 to 813
Calculation steps:
[( 813 - 990 ) ÷ 990] x 100 = -17.88%
Formula
Percentage change = [(813 - 990) / 990] x 100
Subtract the new number by the original number
813 - 990 = -177
-177 ÷ 990 = -0.1787878787878788
-0.1787878787878788 x 100 = -17.88%