-19.49% is the change from 990 to 797
Calculation steps:
[( 797 - 990 ) ÷ 990] x 100 = -19.49%
Formula
Percentage change = [(797 - 990) / 990] x 100
Subtract the new number by the original number
797 - 990 = -193
-193 ÷ 990 = -0.19494949494949496
-0.19494949494949496 x 100 = -19.49%