-3.28% is the change from 518 to 501
Calculation steps:
[( 501 - 518 ) ÷ 518] x 100 = -3.28%
Formula
Percentage change = [(501 - 518) / 518] x 100
Subtract the new number by the original number
501 - 518 = -17
-17 ÷ 518 = -0.032818532818532815
-0.032818532818532815 x 100 = -3.28%