-22.59% is the change from 509 to 394
Calculation steps:
[( 394 - 509 ) ÷ 509] x 100 = -22.59%
Formula
Percentage change = [(394 - 509) / 509] x 100
Subtract the new number by the original number
394 - 509 = -115
-115 ÷ 509 = -0.22593320235756384
-0.22593320235756384 x 100 = -22.59%