-89.74% is the change from 819 to 84
Calculation steps:
[( 84 - 819 ) ÷ 819] x 100 = -89.74%
Formula
Percentage change = [(84 - 819) / 819] x 100
Subtract the new number by the original number
84 - 819 = -735
-735 ÷ 819 = -0.8974358974358975
-0.8974358974358975 x 100 = -89.74%