-12.28% is the change from 521 to 457
Calculation steps:
[( 457 - 521 ) ÷ 521] x 100 = -12.28%
Formula
Percentage change = [(457 - 521) / 521] x 100
Subtract the new number by the original number
457 - 521 = -64
-64 ÷ 521 = -0.12284069097888675
-0.12284069097888675 x 100 = -12.28%