-7.15% is the change from 685 to 636
Calculation steps:
[( 636 - 685 ) ÷ 685] x 100 = -7.15%
Formula
Percentage change = [(636 - 685) / 685] x 100
Subtract the new number by the original number
636 - 685 = -49
-49 ÷ 685 = -0.07153284671532846
-0.07153284671532846 x 100 = -7.15%