-2.44% is the change from 656 to 640
Calculation steps:
[( 640 - 656 ) ÷ 656] x 100 = -2.44%
Formula
Percentage change = [(640 - 656) / 656] x 100
Subtract the new number by the original number
640 - 656 = -16
-16 ÷ 656 = -0.024390243902439025
-0.024390243902439025 x 100 = -2.44%