-2.59% is the change from 501 to 488
Calculation steps:
[( 488 - 501 ) ÷ 501] x 100 = -2.59%
Formula
Percentage change = [(488 - 501) / 501] x 100
Subtract the new number by the original number
488 - 501 = -13
-13 ÷ 501 = -0.02594810379241517
-0.02594810379241517 x 100 = -2.59%