-96.74% is the change from 521 to 17
Calculation steps:
[( 17 - 521 ) ÷ 521] x 100 = -96.74%
Formula
Percentage change = [(17 - 521) / 521] x 100
Subtract the new number by the original number
17 - 521 = -504
-504 ÷ 521 = -0.9673704414587332
-0.9673704414587332 x 100 = -96.74%