-18.43% is the change from 521 to 425
Calculation steps:
[( 425 - 521 ) ÷ 521] x 100 = -18.43%
Formula
Percentage change = [(425 - 521) / 521] x 100
Subtract the new number by the original number
425 - 521 = -96
-96 ÷ 521 = -0.18426103646833014
-0.18426103646833014 x 100 = -18.43%