-46.08% is the change from 638 to 344
Calculation steps:
[( 344 - 638 ) ÷ 638] x 100 = -46.08%
Formula
Percentage change = [(344 - 638) / 638] x 100
Subtract the new number by the original number
344 - 638 = -294
-294 ÷ 638 = -0.4608150470219436
-0.4608150470219436 x 100 = -46.08%