-84.02% is the change from 870 to 139
Calculation steps:
[( 139 - 870 ) ÷ 870] x 100 = -84.02%
Formula
Percentage change = [(139 - 870) / 870] x 100
Subtract the new number by the original number
139 - 870 = -731
-731 ÷ 870 = -0.8402298850574713
-0.8402298850574713 x 100 = -84.02%