-80.83% is the change from 819 to 157
Calculation steps:
[( 157 - 819 ) ÷ 819] x 100 = -80.83%
Formula
Percentage change = [(157 - 819) / 819] x 100
Subtract the new number by the original number
157 - 819 = -662
-662 ÷ 819 = -0.8083028083028083
-0.8083028083028083 x 100 = -80.83%