-23.09% is the change from 511 to 393
Calculation steps:
[( 393 - 511 ) ÷ 511] x 100 = -23.09%
Formula
Percentage change = [(393 - 511) / 511] x 100
Subtract the new number by the original number
393 - 511 = -118
-118 ÷ 511 = -0.2309197651663405
-0.2309197651663405 x 100 = -23.09%