-20.63% is the change from 509 to 404
Calculation steps:
[( 404 - 509 ) ÷ 509] x 100 = -20.63%
Formula
Percentage change = [(404 - 509) / 509] x 100
Subtract the new number by the original number
404 - 509 = -105
-105 ÷ 509 = -0.206286836935167
-0.206286836935167 x 100 = -20.63%