-6.12% is the change from 686 to 644
Calculation steps:
[( 644 - 686 ) ÷ 686] x 100 = -6.12%
Formula
Percentage change = [(644 - 686) / 686] x 100
Subtract the new number by the original number
644 - 686 = -42
-42 ÷ 686 = -0.061224489795918366
-0.061224489795918366 x 100 = -6.12%