-90.81% is the change from 979 to 90
Calculation steps:
[( 90 - 979 ) ÷ 979] x 100 = -90.81%
Formula
Percentage change = [(90 - 979) / 979] x 100
Subtract the new number by the original number
90 - 979 = -889
-889 ÷ 979 = -0.9080694586312564
-0.9080694586312564 x 100 = -90.81%