-0.29% is the change from 686 to 684
Calculation steps:
[( 684 - 686 ) ÷ 686] x 100 = -0.29%
Formula
Percentage change = [(684 - 686) / 686] x 100
Subtract the new number by the original number
684 - 686 = -2
-2 ÷ 686 = -0.0029154518950437317
-0.0029154518950437317 x 100 = -0.29%