-49.1% is the change from 664 to 338
Calculation steps:
[( 338 - 664 ) ÷ 664] x 100 = -49.1%
Formula
Percentage change = [(338 - 664) / 664] x 100
Subtract the new number by the original number
338 - 664 = -326
-326 ÷ 664 = -0.49096385542168675
-0.49096385542168675 x 100 = -49.1%