-23.92% is the change from 669 to 509
Calculation steps:
[( 509 - 669 ) ÷ 669] x 100 = -23.92%
Formula
Percentage change = [(509 - 669) / 669] x 100
Subtract the new number by the original number
509 - 669 = -160
-160 ÷ 669 = -0.23916292974588937
-0.23916292974588937 x 100 = -23.92%