-4.78% is the change from 649 to 618
Calculation steps:
[( 618 - 649 ) ÷ 649] x 100 = -4.78%
Formula
Percentage change = [(618 - 649) / 649] x 100
Subtract the new number by the original number
618 - 649 = -31
-31 ÷ 649 = -0.04776579352850539
-0.04776579352850539 x 100 = -4.78%