-18.07% is the change from 509 to 417
Calculation steps:
[( 417 - 509 ) ÷ 509] x 100 = -18.07%
Formula
Percentage change = [(417 - 509) / 509] x 100
Subtract the new number by the original number
417 - 509 = -92
-92 ÷ 509 = -0.1807465618860511
-0.1807465618860511 x 100 = -18.07%