-50.49% is the change from 509 to 252
Calculation steps:
[( 252 - 509 ) ÷ 509] x 100 = -50.49%
Formula
Percentage change = [(252 - 509) / 509] x 100
Subtract the new number by the original number
252 - 509 = -257
-257 ÷ 509 = -0.5049115913555993
-0.5049115913555993 x 100 = -50.49%