-8.24% is the change from 680 to 624
Calculation steps:
[( 624 - 680 ) ÷ 680] x 100 = -8.24%
Formula
Percentage change = [(624 - 680) / 680] x 100
Subtract the new number by the original number
624 - 680 = -56
-56 ÷ 680 = -0.08235294117647059
-0.08235294117647059 x 100 = -8.24%