-11.15% is the change from 511 to 454
Calculation steps:
[( 454 - 511 ) ÷ 511] x 100 = -11.15%
Formula
Percentage change = [(454 - 511) / 511] x 100
Subtract the new number by the original number
454 - 511 = -57
-57 ÷ 511 = -0.11154598825831702
-0.11154598825831702 x 100 = -11.15%