-98.46% is the change from 521 to 8
Calculation steps:
[( 8 - 521 ) ÷ 521] x 100 = -98.46%
Formula
Percentage change = [(8 - 521) / 521] x 100
Subtract the new number by the original number
8 - 521 = -513
-513 ÷ 521 = -0.9846449136276392
-0.9846449136276392 x 100 = -98.46%