-10.93% is the change from 439 to 391
Calculation steps:
[( 391 - 439 ) ÷ 439] x 100 = -10.93%
Formula
Percentage change = [(391 - 439) / 439] x 100
Subtract the new number by the original number
391 - 439 = -48
-48 ÷ 439 = -0.10933940774487472
-0.10933940774487472 x 100 = -10.93%