-3.54% is the change from 508 to 490
Calculation steps:
[( 490 - 508 ) ÷ 508] x 100 = -3.54%
Formula
Percentage change = [(490 - 508) / 508] x 100
Subtract the new number by the original number
490 - 508 = -18
-18 ÷ 508 = -0.03543307086614173
-0.03543307086614173 x 100 = -3.54%