19.22% is the change from 437 to 521
Calculation steps:
[( 521 - 437 ) ÷ 437] x 100 = 19.22%
Formula
Percentage change = [(521 - 437) / 437] x 100
Subtract the new number by the original number
521 - 437 = 84
84 ÷ 437 = 0.19221967963386727
0.19221967963386727 x 100 = 19.22%