-79.28% is the change from 671 to 139
Calculation steps:
[( 139 - 671 ) ÷ 671] x 100 = -79.28%
Formula
Percentage change = [(139 - 671) / 671] x 100
Subtract the new number by the original number
139 - 671 = -532
-532 ÷ 671 = -0.7928464977645305
-0.7928464977645305 x 100 = -79.28%