-96.93% is the change from 521 to 16
Calculation steps:
[( 16 - 521 ) ÷ 521] x 100 = -96.93%
Formula
Percentage change = [(16 - 521) / 521] x 100
Subtract the new number by the original number
16 - 521 = -505
-505 ÷ 521 = -0.9692898272552783
-0.9692898272552783 x 100 = -96.93%