-2.51% is the change from 439 to 428
Calculation steps:
[( 428 - 439 ) ÷ 439] x 100 = -2.51%
Formula
Percentage change = [(428 - 439) / 439] x 100
Subtract the new number by the original number
428 - 439 = -11
-11 ÷ 439 = -0.025056947608200455
-0.025056947608200455 x 100 = -2.51%