-93.32% is the change from 509 to 34
Calculation steps:
[( 34 - 509 ) ÷ 509] x 100 = -93.32%
Formula
Percentage change = [(34 - 509) / 509] x 100
Subtract the new number by the original number
34 - 509 = -475
-475 ÷ 509 = -0.9332023575638507
-0.9332023575638507 x 100 = -93.32%