-17.73% is the change from 609 to 501
Calculation steps:
[( 501 - 609 ) ÷ 609] x 100 = -17.73%
Formula
Percentage change = [(501 - 609) / 609] x 100
Subtract the new number by the original number
501 - 609 = -108
-108 ÷ 609 = -0.17733990147783252
-0.17733990147783252 x 100 = -17.73%