-48.66% is the change from 670 to 344
Calculation steps:
[( 344 - 670 ) ÷ 670] x 100 = -48.66%
Formula
Percentage change = [(344 - 670) / 670] x 100
Subtract the new number by the original number
344 - 670 = -326
-326 ÷ 670 = -0.48656716417910445
-0.48656716417910445 x 100 = -48.66%