-91.48% is the change from 939 to 80
Calculation steps:
[( 80 - 939 ) ÷ 939] x 100 = -91.48%
Formula
Percentage change = [(80 - 939) / 939] x 100
Subtract the new number by the original number
80 - 939 = -859
-859 ÷ 939 = -0.9148029818956337
-0.9148029818956337 x 100 = -91.48%