-91.41% is the change from 931 to 80
Calculation steps:
[( 80 - 931 ) ÷ 931] x 100 = -91.41%
Formula
Percentage change = [(80 - 931) / 931] x 100
Subtract the new number by the original number
80 - 931 = -851
-851 ÷ 931 = -0.9140708915145005
-0.9140708915145005 x 100 = -91.41%