-17.9% is the change from 609 to 500
Calculation steps:
[( 500 - 609 ) ÷ 609] x 100 = -17.9%
Formula
Percentage change = [(500 - 609) / 609] x 100
Subtract the new number by the original number
500 - 609 = -109
-109 ÷ 609 = -0.17898193760262726
-0.17898193760262726 x 100 = -17.9%