-0.99% is the change from 503 to 498
Calculation steps:
[( 498 - 503 ) ÷ 503] x 100 = -0.99%
Formula
Percentage change = [(498 - 503) / 503] x 100
Subtract the new number by the original number
498 - 503 = -5
-5 ÷ 503 = -0.009940357852882704
-0.009940357852882704 x 100 = -0.99%