-18.93% is the change from 618 to 501
Calculation steps:
[( 501 - 618 ) ÷ 618] x 100 = -18.93%
Formula
Percentage change = [(501 - 618) / 618] x 100
Subtract the new number by the original number
501 - 618 = -117
-117 ÷ 618 = -0.18932038834951456
-0.18932038834951456 x 100 = -18.93%