-81.2% is the change from 819 to 154
Calculation steps:
[( 154 - 819 ) ÷ 819] x 100 = -81.2%
Formula
Percentage change = [(154 - 819) / 819] x 100
Subtract the new number by the original number
154 - 819 = -665
-665 ÷ 819 = -0.811965811965812
-0.811965811965812 x 100 = -81.2%