-4.11% is the change from 438 to 420
Calculation steps:
[( 420 - 438 ) ÷ 438] x 100 = -4.11%
Formula
Percentage change = [(420 - 438) / 438] x 100
Subtract the new number by the original number
420 - 438 = -18
-18 ÷ 438 = -0.0410958904109589
-0.0410958904109589 x 100 = -4.11%