-19.82% is the change from 999 to 801
Calculation steps:
[( 801 - 999 ) ÷ 999] x 100 = -19.82%
Formula
Percentage change = [(801 - 999) / 999] x 100
Subtract the new number by the original number
801 - 999 = -198
-198 ÷ 999 = -0.1981981981981982
-0.1981981981981982 x 100 = -19.82%