-48.5% is the change from 668 to 344
Calculation steps:
[( 344 - 668 ) ÷ 668] x 100 = -48.5%
Formula
Percentage change = [(344 - 668) / 668] x 100
Subtract the new number by the original number
344 - 668 = -324
-324 ÷ 668 = -0.48502994011976047
-0.48502994011976047 x 100 = -48.5%