-9.78% is the change from 685 to 618
Calculation steps:
[( 618 - 685 ) ÷ 685] x 100 = -9.78%
Formula
Percentage change = [(618 - 685) / 685] x 100
Subtract the new number by the original number
618 - 685 = -67
-67 ÷ 685 = -0.09781021897810219
-0.09781021897810219 x 100 = -9.78%