-19.96% is the change from 521 to 417
Calculation steps:
[( 417 - 521 ) ÷ 521] x 100 = -19.96%
Formula
Percentage change = [(417 - 521) / 521] x 100
Subtract the new number by the original number
417 - 521 = -104
-104 ÷ 521 = -0.19961612284069097
-0.19961612284069097 x 100 = -19.96%