27.26% is the change from 521 to 663
Calculation steps:
[( 663 - 521 ) ÷ 521] x 100 = 27.26%
Formula
Percentage change = [(663 - 521) / 521] x 100
Subtract the new number by the original number
663 - 521 = 142
142 ÷ 521 = 0.272552783109405
0.272552783109405 x 100 = 27.26%