27.04% is the change from 503 to 639
Calculation steps:
[( 639 - 503 ) ÷ 503] x 100 = 27.04%
Formula
Percentage change = [(639 - 503) / 503] x 100
Subtract the new number by the original number
639 - 503 = 136
136 ÷ 503 = 0.27037773359840955
0.27037773359840955 x 100 = 27.04%