-85.8% is the change from 979 to 139
Calculation steps:
[( 139 - 979 ) ÷ 979] x 100 = -85.8%
Formula
Percentage change = [(139 - 979) / 979] x 100
Subtract the new number by the original number
139 - 979 = -840
-840 ÷ 979 = -0.8580183861082737
-0.8580183861082737 x 100 = -85.8%