-99.04% is the change from 521 to 5
Calculation steps:
[( 5 - 521 ) ÷ 521] x 100 = -99.04%
Formula
Percentage change = [(5 - 521) / 521] x 100
Subtract the new number by the original number
5 - 521 = -516
-516 ÷ 521 = -0.9904030710172744
-0.9904030710172744 x 100 = -99.04%