-12.09% is the change from 521 to 458
Calculation steps:
[( 458 - 521 ) ÷ 521] x 100 = -12.09%
Formula
Percentage change = [(458 - 521) / 521] x 100
Subtract the new number by the original number
458 - 521 = -63
-63 ÷ 521 = -0.12092130518234165
-0.12092130518234165 x 100 = -12.09%