-80.71% is the change from 819 to 158
Calculation steps:
[( 158 - 819 ) ÷ 819] x 100 = -80.71%
Formula
Percentage change = [(158 - 819) / 819] x 100
Subtract the new number by the original number
158 - 819 = -661
-661 ÷ 819 = -0.8070818070818071
-0.8070818070818071 x 100 = -80.71%