-99.2% is the change from 501 to 4
Calculation steps:
[( 4 - 501 ) ÷ 501] x 100 = -99.2%
Formula
Percentage change = [(4 - 501) / 501] x 100
Subtract the new number by the original number
4 - 501 = -497
-497 ÷ 501 = -0.9920159680638723
-0.9920159680638723 x 100 = -99.2%