-98.5% is the change from 599 to 9
Calculation steps:
[( 9 - 599 ) ÷ 599] x 100 = -98.5%
Formula
Percentage change = [(9 - 599) / 599] x 100
Subtract the new number by the original number
9 - 599 = -590
-590 ÷ 599 = -0.9849749582637729
-0.9849749582637729 x 100 = -98.5%