-35.36% is the change from 509 to 329
Calculation steps:
[( 329 - 509 ) ÷ 509] x 100 = -35.36%
Formula
Percentage change = [(329 - 509) / 509] x 100
Subtract the new number by the original number
329 - 509 = -180
-180 ÷ 509 = -0.35363457760314343
-0.35363457760314343 x 100 = -35.36%