-3.73% is the change from 509 to 490
Calculation steps:
[( 490 - 509 ) ÷ 509] x 100 = -3.73%
Formula
Percentage change = [(490 - 509) / 509] x 100
Subtract the new number by the original number
490 - 509 = -19
-19 ÷ 509 = -0.03732809430255403
-0.03732809430255403 x 100 = -3.73%