-99.5% is the change from 605 to 3
Calculation steps:
[( 3 - 605 ) ÷ 605] x 100 = -99.5%
Formula
Percentage change = [(3 - 605) / 605] x 100
Subtract the new number by the original number
3 - 605 = -602
-602 ÷ 605 = -0.9950413223140496
-0.9950413223140496 x 100 = -99.5%