-12.48% is the change from 521 to 456
Calculation steps:
[( 456 - 521 ) ÷ 521] x 100 = -12.48%
Formula
Percentage change = [(456 - 521) / 521] x 100
Subtract the new number by the original number
456 - 521 = -65
-65 ÷ 521 = -0.12476007677543186
-0.12476007677543186 x 100 = -12.48%