-38.51% is the change from 509 to 313
Calculation steps:
[( 313 - 509 ) ÷ 509] x 100 = -38.51%
Formula
Percentage change = [(313 - 509) / 509] x 100
Subtract the new number by the original number
313 - 509 = -196
-196 ÷ 509 = -0.3850687622789784
-0.3850687622789784 x 100 = -38.51%