-91.93% is the change from 979 to 79
Calculation steps:
[( 79 - 979 ) ÷ 979] x 100 = -91.93%
Formula
Percentage change = [(79 - 979) / 979] x 100
Subtract the new number by the original number
79 - 979 = -900
-900 ÷ 979 = -0.9193054136874361
-0.9193054136874361 x 100 = -91.93%