-5.55% is the change from 685 to 647
Calculation steps:
[( 647 - 685 ) ÷ 685] x 100 = -5.55%
Formula
Percentage change = [(647 - 685) / 685] x 100
Subtract the new number by the original number
647 - 685 = -38
-38 ÷ 685 = -0.05547445255474453
-0.05547445255474453 x 100 = -5.55%