-1.35% is the change from 518 to 511
Calculation steps:
[( 511 - 518 ) ÷ 518] x 100 = -1.35%
Formula
Percentage change = [(511 - 518) / 518] x 100
Subtract the new number by the original number
511 - 518 = -7
-7 ÷ 518 = -0.013513513513513514
-0.013513513513513514 x 100 = -1.35%