-39.9% is the change from 421 to 253
Calculation steps:
[( 253 - 421 ) ÷ 421] x 100 = -39.9%
Formula
Percentage change = [(253 - 421) / 421] x 100
Subtract the new number by the original number
253 - 421 = -168
-168 ÷ 421 = -0.3990498812351544
-0.3990498812351544 x 100 = -39.9%