-80.95% is the change from 819 to 156
Calculation steps:
[( 156 - 819 ) ÷ 819] x 100 = -80.95%
Formula
Percentage change = [(156 - 819) / 819] x 100
Subtract the new number by the original number
156 - 819 = -663
-663 ÷ 819 = -0.8095238095238095
-0.8095238095238095 x 100 = -80.95%