-6.28% is the change from 685 to 642
Calculation steps:
[( 642 - 685 ) ÷ 685] x 100 = -6.28%
Formula
Percentage change = [(642 - 685) / 685] x 100
Subtract the new number by the original number
642 - 685 = -43
-43 ÷ 685 = -0.06277372262773723
-0.06277372262773723 x 100 = -6.28%