-11.39% is the change from 509 to 451
Calculation steps:
[( 451 - 509 ) ÷ 509] x 100 = -11.39%
Formula
Percentage change = [(451 - 509) / 509] x 100
Subtract the new number by the original number
451 - 509 = -58
-58 ÷ 509 = -0.11394891944990176
-0.11394891944990176 x 100 = -11.39%