-4.33% is the change from 439 to 420
Calculation steps:
[( 420 - 439 ) ÷ 439] x 100 = -4.33%
Formula
Percentage change = [(420 - 439) / 439] x 100
Subtract the new number by the original number
420 - 439 = -19
-19 ÷ 439 = -0.04328018223234624
-0.04328018223234624 x 100 = -4.33%