-99.5% is the change from 599 to 3
Calculation steps:
[( 3 - 599 ) ÷ 599] x 100 = -99.5%
Formula
Percentage change = [(3 - 599) / 599] x 100
Subtract the new number by the original number
3 - 599 = -596
-596 ÷ 599 = -0.994991652754591
-0.994991652754591 x 100 = -99.5%