-4.09% is the change from 635 to 609
Calculation steps:
[( 609 - 635 ) ÷ 635] x 100 = -4.09%
Formula
Percentage change = [(609 - 635) / 635] x 100
Subtract the new number by the original number
609 - 635 = -26
-26 ÷ 635 = -0.04094488188976378
-0.04094488188976378 x 100 = -4.09%