-73.48% is the change from 509 to 135
Calculation steps:
[( 135 - 509 ) ÷ 509] x 100 = -73.48%
Formula
Percentage change = [(135 - 509) / 509] x 100
Subtract the new number by the original number
135 - 509 = -374
-374 ÷ 509 = -0.7347740667976425
-0.7347740667976425 x 100 = -73.48%