-21.35% is the change from 979 to 770
Calculation steps:
[( 770 - 979 ) ÷ 979] x 100 = -21.35%
Formula
Percentage change = [(770 - 979) / 979] x 100
Subtract the new number by the original number
770 - 979 = -209
-209 ÷ 979 = -0.21348314606741572
-0.21348314606741572 x 100 = -21.35%