-7.21% is the change from 666 to 618
Calculation steps:
[( 618 - 666 ) ÷ 666] x 100 = -7.21%
Formula
Percentage change = [(618 - 666) / 666] x 100
Subtract the new number by the original number
618 - 666 = -48
-48 ÷ 666 = -0.07207207207207207
-0.07207207207207207 x 100 = -7.21%