-19.9% is the change from 990 to 793
Calculation steps:
[( 793 - 990 ) ÷ 990] x 100 = -19.9%
Formula
Percentage change = [(793 - 990) / 990] x 100
Subtract the new number by the original number
793 - 990 = -197
-197 ÷ 990 = -0.198989898989899
-0.198989898989899 x 100 = -19.9%