-40.51% is the change from 511 to 304
Calculation steps:
[( 304 - 511 ) ÷ 511] x 100 = -40.51%
Formula
Percentage change = [(304 - 511) / 511] x 100
Subtract the new number by the original number
304 - 511 = -207
-207 ÷ 511 = -0.4050880626223092
-0.4050880626223092 x 100 = -40.51%