-0.8% is the change from 502 to 498
Calculation steps:
[( 498 - 502 ) ÷ 502] x 100 = -0.8%
Formula
Percentage change = [(498 - 502) / 502] x 100
Subtract the new number by the original number
498 - 502 = -4
-4 ÷ 502 = -0.00796812749003984
-0.00796812749003984 x 100 = -0.8%