-2.99% is the change from 502 to 487
Calculation steps:
[( 487 - 502 ) ÷ 502] x 100 = -2.99%
Formula
Percentage change = [(487 - 502) / 502] x 100
Subtract the new number by the original number
487 - 502 = -15
-15 ÷ 502 = -0.029880478087649404
-0.029880478087649404 x 100 = -2.99%