-19.01% is the change from 847 to 686
Calculation steps:
[( 686 - 847 ) ÷ 847] x 100 = -19.01%
Formula
Percentage change = [(686 - 847) / 847] x 100
Subtract the new number by the original number
686 - 847 = -161
-161 ÷ 847 = -0.19008264462809918
-0.19008264462809918 x 100 = -19.01%