3.5% is the change from 515 to 533
Calculation steps:
[( 533 - 515 ) ÷ 515] x 100 = 3.5%
Formula
Percentage change = [(533 - 515) / 515] x 100
Subtract the new number by the original number
533 - 515 = 18
18 ÷ 515 = 0.03495145631067961
0.03495145631067961 x 100 = 3.5%