-38.8% is the change from 518 to 317
Calculation steps:
[( 317 - 518 ) ÷ 518] x 100 = -38.8%
Formula
Percentage change = [(317 - 518) / 518] x 100
Subtract the new number by the original number
317 - 518 = -201
-201 ÷ 518 = -0.38803088803088803
-0.38803088803088803 x 100 = -38.8%