-12.67% is the change from 521 to 455
Calculation steps:
[( 455 - 521 ) ÷ 521] x 100 = -12.67%
Formula
Percentage change = [(455 - 521) / 521] x 100
Subtract the new number by the original number
455 - 521 = -66
-66 ÷ 521 = -0.12667946257197696
-0.12667946257197696 x 100 = -12.67%