-48.27% is the change from 665 to 344
Calculation steps:
[( 344 - 665 ) ÷ 665] x 100 = -48.27%
Formula
Percentage change = [(344 - 665) / 665] x 100
Subtract the new number by the original number
344 - 665 = -321
-321 ÷ 665 = -0.48270676691729325
-0.48270676691729325 x 100 = -48.27%