18.95% is the change from 438 to 521
Calculation steps:
[( 521 - 438 ) ÷ 438] x 100 = 18.95%
Formula
Percentage change = [(521 - 438) / 438] x 100
Subtract the new number by the original number
521 - 438 = 83
83 ÷ 438 = 0.18949771689497716
0.18949771689497716 x 100 = 18.95%