-18.86% is the change from 684 to 555
Calculation steps:
[( 555 - 684 ) ÷ 684] x 100 = -18.86%
Formula
Percentage change = [(555 - 684) / 684] x 100
Subtract the new number by the original number
555 - 684 = -129
-129 ÷ 684 = -0.18859649122807018
-0.18859649122807018 x 100 = -18.86%