-5.84% is the change from 685 to 645
Calculation steps:
[( 645 - 685 ) ÷ 685] x 100 = -5.84%
Formula
Percentage change = [(645 - 685) / 685] x 100
Subtract the new number by the original number
645 - 685 = -40
-40 ÷ 685 = -0.058394160583941604
-0.058394160583941604 x 100 = -5.84%