-81.97% is the change from 771 to 139
Calculation steps:
[( 139 - 771 ) ÷ 771] x 100 = -81.97%
Formula
Percentage change = [(139 - 771) / 771] x 100
Subtract the new number by the original number
139 - 771 = -632
-632 ÷ 771 = -0.8197146562905318
-0.8197146562905318 x 100 = -81.97%