-2.99% is the change from 501 to 486
Calculation steps:
[( 486 - 501 ) ÷ 501] x 100 = -2.99%
Formula
Percentage change = [(486 - 501) / 501] x 100
Subtract the new number by the original number
486 - 501 = -15
-15 ÷ 501 = -0.029940119760479042
-0.029940119760479042 x 100 = -2.99%