-4.71% is the change from 680 to 648
Calculation steps:
[( 648 - 680 ) ÷ 680] x 100 = -4.71%
Formula
Percentage change = [(648 - 680) / 680] x 100
Subtract the new number by the original number
648 - 680 = -32
-32 ÷ 680 = -0.047058823529411764
-0.047058823529411764 x 100 = -4.71%