-17.8% is the change from 618 to 508
Calculation steps:
[( 508 - 618 ) ÷ 618] x 100 = -17.8%
Formula
Percentage change = [(508 - 618) / 618] x 100
Subtract the new number by the original number
508 - 618 = -110
-110 ÷ 618 = -0.1779935275080906
-0.1779935275080906 x 100 = -17.8%