-4.22% is the change from 664 to 636
Calculation steps:
[( 636 - 664 ) ÷ 664] x 100 = -4.22%
Formula
Percentage change = [(636 - 664) / 664] x 100
Subtract the new number by the original number
636 - 664 = -28
-28 ÷ 664 = -0.04216867469879518
-0.04216867469879518 x 100 = -4.22%