-5.21% is the change from 518 to 491
Calculation steps:
[( 491 - 518 ) ÷ 518] x 100 = -5.21%
Formula
Percentage change = [(491 - 518) / 518] x 100
Subtract the new number by the original number
491 - 518 = -27
-27 ÷ 518 = -0.052123552123552123
-0.052123552123552123 x 100 = -5.21%