31.81% is the change from 503 to 663
Calculation steps:
[( 663 - 503 ) ÷ 503] x 100 = 31.81%
Formula
Percentage change = [(663 - 503) / 503] x 100
Subtract the new number by the original number
663 - 503 = 160
160 ÷ 503 = 0.31809145129224653
0.31809145129224653 x 100 = 31.81%