-2.41% is the change from 664 to 648
Calculation steps:
[( 648 - 664 ) ÷ 664] x 100 = -2.41%
Formula
Percentage change = [(648 - 664) / 664] x 100
Subtract the new number by the original number
648 - 664 = -16
-16 ÷ 664 = -0.024096385542168676
-0.024096385542168676 x 100 = -2.41%