-15.66% is the change from 511 to 431
Calculation steps:
[( 431 - 511 ) ÷ 511] x 100 = -15.66%
Formula
Percentage change = [(431 - 511) / 511] x 100
Subtract the new number by the original number
431 - 511 = -80
-80 ÷ 511 = -0.15655577299412915
-0.15655577299412915 x 100 = -15.66%