-4.19% is the change from 645 to 618
Calculation steps:
[( 618 - 645 ) ÷ 645] x 100 = -4.19%
Formula
Percentage change = [(618 - 645) / 645] x 100
Subtract the new number by the original number
618 - 645 = -27
-27 ÷ 645 = -0.04186046511627907
-0.04186046511627907 x 100 = -4.19%