-2.94% is the change from 510 to 495
Calculation steps:
[( 495 - 510 ) ÷ 510] x 100 = -2.94%
Formula
Percentage change = [(495 - 510) / 510] x 100
Subtract the new number by the original number
495 - 510 = -15
-15 ÷ 510 = -0.029411764705882353
-0.029411764705882353 x 100 = -2.94%