-15.1% is the change from 808 to 686
Calculation steps:
[( 686 - 808 ) ÷ 808] x 100 = -15.1%
Formula
Percentage change = [(686 - 808) / 808] x 100
Subtract the new number by the original number
686 - 808 = -122
-122 ÷ 808 = -0.15099009900990099
-0.15099009900990099 x 100 = -15.1%