-18.39% is the change from 843 to 688
Calculation steps:
[( 688 - 843 ) ÷ 843] x 100 = -18.39%
Formula
Percentage change = [(688 - 843) / 843] x 100
Subtract the new number by the original number
688 - 843 = -155
-155 ÷ 843 = -0.18386714116251482
-0.18386714116251482 x 100 = -18.39%