-96.48% is the change from 511 to 18
Calculation steps:
[( 18 - 511 ) ÷ 511] x 100 = -96.48%
Formula
Percentage change = [(18 - 511) / 511] x 100
Subtract the new number by the original number
18 - 511 = -493
-493 ÷ 511 = -0.9647749510763209
-0.9647749510763209 x 100 = -96.48%