14.51% is the change from 455 to 521
Calculation steps:
[( 521 - 455 ) ÷ 455] x 100 = 14.51%
Formula
Percentage change = [(521 - 455) / 455] x 100
Subtract the new number by the original number
521 - 455 = 66
66 ÷ 455 = 0.14505494505494507
0.14505494505494507 x 100 = 14.51%