-22.46% is the change from 668 to 518
Calculation steps:
[( 518 - 668 ) ÷ 668] x 100 = -22.46%
Formula
Percentage change = [(518 - 668) / 668] x 100
Subtract the new number by the original number
518 - 668 = -150
-150 ÷ 668 = -0.2245508982035928
-0.2245508982035928 x 100 = -22.46%