-97.31% is the change from 521 to 14
Calculation steps:
[( 14 - 521 ) ÷ 521] x 100 = -97.31%
Formula
Percentage change = [(14 - 521) / 521] x 100
Subtract the new number by the original number
14 - 521 = -507
-507 ÷ 521 = -0.9731285988483686
-0.9731285988483686 x 100 = -97.31%