-25.6% is the change from 668 to 497
Calculation steps:
[( 497 - 668 ) ÷ 668] x 100 = -25.6%
Formula
Percentage change = [(497 - 668) / 668] x 100
Subtract the new number by the original number
497 - 668 = -171
-171 ÷ 668 = -0.2559880239520958
-0.2559880239520958 x 100 = -25.6%