-17.96% is the change from 618 to 507
Calculation steps:
[( 507 - 618 ) ÷ 618] x 100 = -17.96%
Formula
Percentage change = [(507 - 618) / 618] x 100
Subtract the new number by the original number
507 - 618 = -111
-111 ÷ 618 = -0.1796116504854369
-0.1796116504854369 x 100 = -17.96%