-2.77% is the change from 686 to 667
Calculation steps:
[( 667 - 686 ) ÷ 686] x 100 = -2.77%
Formula
Percentage change = [(667 - 686) / 686] x 100
Subtract the new number by the original number
667 - 686 = -19
-19 ÷ 686 = -0.027696793002915453
-0.027696793002915453 x 100 = -2.77%