-96.28% is the change from 511 to 19
Calculation steps:
[( 19 - 511 ) ÷ 511] x 100 = -96.28%
Formula
Percentage change = [(19 - 511) / 511] x 100
Subtract the new number by the original number
19 - 511 = -492
-492 ÷ 511 = -0.9628180039138943
-0.9628180039138943 x 100 = -96.28%