-0.39% is the change from 512 to 510
Calculation steps:
[( 510 - 512 ) ÷ 512] x 100 = -0.39%
Formula
Percentage change = [(510 - 512) / 512] x 100
Subtract the new number by the original number
510 - 512 = -2
-2 ÷ 512 = -0.00390625
-0.00390625 x 100 = -0.39%