-38.22% is the change from 518 to 320
Calculation steps:
[( 320 - 518 ) ÷ 518] x 100 = -38.22%
Formula
Percentage change = [(320 - 518) / 518] x 100
Subtract the new number by the original number
320 - 518 = -198
-198 ÷ 518 = -0.38223938223938225
-0.38223938223938225 x 100 = -38.22%