-18.24% is the change from 680 to 556
Calculation steps:
[( 556 - 680 ) ÷ 680] x 100 = -18.24%
Formula
Percentage change = [(556 - 680) / 680] x 100
Subtract the new number by the original number
556 - 680 = -124
-124 ÷ 680 = -0.18235294117647058
-0.18235294117647058 x 100 = -18.24%