-81.56% is the change from 819 to 151
Calculation steps:
[( 151 - 819 ) ÷ 819] x 100 = -81.56%
Formula
Percentage change = [(151 - 819) / 819] x 100
Subtract the new number by the original number
151 - 819 = -668
-668 ÷ 819 = -0.8156288156288156
-0.8156288156288156 x 100 = -81.56%