-0.15% is the change from 686 to 685
Calculation steps:
[( 685 - 686 ) ÷ 686] x 100 = -0.15%
Formula
Percentage change = [(685 - 686) / 686] x 100
Subtract the new number by the original number
685 - 686 = -1
-1 ÷ 686 = -0.0014577259475218659
-0.0014577259475218659 x 100 = -0.15%