-15.85% is the change from 511 to 430
Calculation steps:
[( 430 - 511 ) ÷ 511] x 100 = -15.85%
Formula
Percentage change = [(430 - 511) / 511] x 100
Subtract the new number by the original number
430 - 511 = -81
-81 ÷ 511 = -0.15851272015655576
-0.15851272015655576 x 100 = -15.85%