-3.66% is the change from 819 to 789
Calculation steps:
[( 789 - 819 ) ÷ 819] x 100 = -3.66%
Formula
Percentage change = [(789 - 819) / 819] x 100
Subtract the new number by the original number
789 - 819 = -30
-30 ÷ 819 = -0.03663003663003663
-0.03663003663003663 x 100 = -3.66%