-2.54% is the change from 512 to 499
Calculation steps:
[( 499 - 512 ) ÷ 512] x 100 = -2.54%
Formula
Percentage change = [(499 - 512) / 512] x 100
Subtract the new number by the original number
499 - 512 = -13
-13 ÷ 512 = -0.025390625
-0.025390625 x 100 = -2.54%