-2.68% is the change from 635 to 618
Calculation steps:
[( 618 - 635 ) ÷ 635] x 100 = -2.68%
Formula
Percentage change = [(618 - 635) / 635] x 100
Subtract the new number by the original number
618 - 635 = -17
-17 ÷ 635 = -0.026771653543307086
-0.026771653543307086 x 100 = -2.68%