-23.97% is the change from 509 to 387
Calculation steps:
[( 387 - 509 ) ÷ 509] x 100 = -23.97%
Formula
Percentage change = [(387 - 509) / 509] x 100
Subtract the new number by the original number
387 - 509 = -122
-122 ÷ 509 = -0.23968565815324164
-0.23968565815324164 x 100 = -23.97%