-5.54% is the change from 686 to 648
Calculation steps:
[( 648 - 686 ) ÷ 686] x 100 = -5.54%
Formula
Percentage change = [(648 - 686) / 686] x 100
Subtract the new number by the original number
648 - 686 = -38
-38 ÷ 686 = -0.05539358600583091
-0.05539358600583091 x 100 = -5.54%