-3.14% is the change from 669 to 648
Calculation steps:
[( 648 - 669 ) ÷ 669] x 100 = -3.14%
Formula
Percentage change = [(648 - 669) / 669] x 100
Subtract the new number by the original number
648 - 669 = -21
-21 ÷ 669 = -0.03139013452914798
-0.03139013452914798 x 100 = -3.14%