15.9% is the change from 503 to 583
Calculation steps:
[( 583 - 503 ) ÷ 503] x 100 = 15.9%
Formula
Percentage change = [(583 - 503) / 503] x 100
Subtract the new number by the original number
583 - 503 = 80
80 ÷ 503 = 0.15904572564612326
0.15904572564612326 x 100 = 15.9%