-69.35% is the change from 509 to 156
Calculation steps:
[( 156 - 509 ) ÷ 509] x 100 = -69.35%
Formula
Percentage change = [(156 - 509) / 509] x 100
Subtract the new number by the original number
156 - 509 = -353
-353 ÷ 509 = -0.693516699410609
-0.693516699410609 x 100 = -69.35%