-17.68% is the change from 509 to 419
Calculation steps:
[( 419 - 509 ) ÷ 509] x 100 = -17.68%
Formula
Percentage change = [(419 - 509) / 509] x 100
Subtract the new number by the original number
419 - 509 = -90
-90 ÷ 509 = -0.17681728880157171
-0.17681728880157171 x 100 = -17.68%