-99.01% is the change from 506 to 5
Calculation steps:
[( 5 - 506 ) ÷ 506] x 100 = -99.01%
Formula
Percentage change = [(5 - 506) / 506] x 100
Subtract the new number by the original number
5 - 506 = -501
-501 ÷ 506 = -0.9901185770750988
-0.9901185770750988 x 100 = -99.01%