-35.17% is the change from 509 to 330
Calculation steps:
[( 330 - 509 ) ÷ 509] x 100 = -35.17%
Formula
Percentage change = [(330 - 509) / 509] x 100
Subtract the new number by the original number
330 - 509 = -179
-179 ÷ 509 = -0.3516699410609037
-0.3516699410609037 x 100 = -35.17%