-10.61% is the change from 509 to 455
Calculation steps:
[( 455 - 509 ) ÷ 509] x 100 = -10.61%
Formula
Percentage change = [(455 - 509) / 509] x 100
Subtract the new number by the original number
455 - 509 = -54
-54 ÷ 509 = -0.10609037328094302
-0.10609037328094302 x 100 = -10.61%