-2.26% is the change from 664 to 649
Calculation steps:
[( 649 - 664 ) ÷ 664] x 100 = -2.26%
Formula
Percentage change = [(649 - 664) / 664] x 100
Subtract the new number by the original number
649 - 664 = -15
-15 ÷ 664 = -0.022590361445783132
-0.022590361445783132 x 100 = -2.26%