-8.42% is the change from 665 to 609
Calculation steps:
[( 609 - 665 ) ÷ 665] x 100 = -8.42%
Formula
Percentage change = [(609 - 665) / 665] x 100
Subtract the new number by the original number
609 - 665 = -56
-56 ÷ 665 = -0.08421052631578947
-0.08421052631578947 x 100 = -8.42%