-4.25% is the change from 636 to 609
Calculation steps:
[( 609 - 636 ) ÷ 636] x 100 = -4.25%
Formula
Percentage change = [(609 - 636) / 636] x 100
Subtract the new number by the original number
609 - 636 = -27
-27 ÷ 636 = -0.04245283018867924
-0.04245283018867924 x 100 = -4.25%