-5.08% is the change from 512 to 486
Calculation steps:
[( 486 - 512 ) ÷ 512] x 100 = -5.08%
Formula
Percentage change = [(486 - 512) / 512] x 100
Subtract the new number by the original number
486 - 512 = -26
-26 ÷ 512 = -0.05078125
-0.05078125 x 100 = -5.08%