2.78% is the change from 503 to 517
Calculation steps:
[( 517 - 503 ) ÷ 503] x 100 = 2.78%
Formula
Percentage change = [(517 - 503) / 503] x 100
Subtract the new number by the original number
517 - 503 = 14
14 ÷ 503 = 0.027833001988071572
0.027833001988071572 x 100 = 2.78%