-24.07% is the change from 511 to 388
Calculation steps:
[( 388 - 511 ) ÷ 511] x 100 = -24.07%
Formula
Percentage change = [(388 - 511) / 511] x 100
Subtract the new number by the original number
388 - 511 = -123
-123 ÷ 511 = -0.24070450097847357
-0.24070450097847357 x 100 = -24.07%