-2.26% is the change from 663 to 648
Calculation steps:
[( 648 - 663 ) ÷ 663] x 100 = -2.26%
Formula
Percentage change = [(648 - 663) / 663] x 100
Subtract the new number by the original number
648 - 663 = -15
-15 ÷ 663 = -0.02262443438914027
-0.02262443438914027 x 100 = -2.26%