-83.03% is the change from 819 to 139
Calculation steps:
[( 139 - 819 ) ÷ 819] x 100 = -83.03%
Formula
Percentage change = [(139 - 819) / 819] x 100
Subtract the new number by the original number
139 - 819 = -680
-680 ÷ 819 = -0.8302808302808303
-0.8302808302808303 x 100 = -83.03%