-4.79% is the change from 668 to 636
Calculation steps:
[( 636 - 668 ) ÷ 668] x 100 = -4.79%
Formula
Percentage change = [(636 - 668) / 668] x 100
Subtract the new number by the original number
636 - 668 = -32
-32 ÷ 668 = -0.04790419161676647
-0.04790419161676647 x 100 = -4.79%