-22.6% is the change from 668 to 517
Calculation steps:
[( 517 - 668 ) ÷ 668] x 100 = -22.6%
Formula
Percentage change = [(517 - 668) / 668] x 100
Subtract the new number by the original number
517 - 668 = -151
-151 ÷ 668 = -0.22604790419161677
-0.22604790419161677 x 100 = -22.6%