-18.62% is the change from 843 to 686
Calculation steps:
[( 686 - 843 ) ÷ 843] x 100 = -18.62%
Formula
Percentage change = [(686 - 843) / 843] x 100
Subtract the new number by the original number
686 - 843 = -157
-157 ÷ 843 = -0.18623962040332148
-0.18623962040332148 x 100 = -18.62%