-33.99% is the change from 509 to 336
Calculation steps:
[( 336 - 509 ) ÷ 509] x 100 = -33.99%
Formula
Percentage change = [(336 - 509) / 509] x 100
Subtract the new number by the original number
336 - 509 = -173
-173 ÷ 509 = -0.33988212180746563
-0.33988212180746563 x 100 = -33.99%