-81.93% is the change from 819 to 148
Calculation steps:
[( 148 - 819 ) ÷ 819] x 100 = -81.93%
Formula
Percentage change = [(148 - 819) / 819] x 100
Subtract the new number by the original number
148 - 819 = -671
-671 ÷ 819 = -0.8192918192918193
-0.8192918192918193 x 100 = -81.93%