-93.52% is the change from 509 to 33
Calculation steps:
[( 33 - 509 ) ÷ 509] x 100 = -93.52%
Formula
Percentage change = [(33 - 509) / 509] x 100
Subtract the new number by the original number
33 - 509 = -476
-476 ÷ 509 = -0.9351669941060904
-0.9351669941060904 x 100 = -93.52%