-16.87% is the change from 990 to 823
Calculation steps:
[( 823 - 990 ) ÷ 990] x 100 = -16.87%
Formula
Percentage change = [(823 - 990) / 990] x 100
Subtract the new number by the original number
823 - 990 = -167
-167 ÷ 990 = -0.1686868686868687
-0.1686868686868687 x 100 = -16.87%