-99.51% is the change from 609 to 3
Calculation steps:
[( 3 - 609 ) ÷ 609] x 100 = -99.51%
Formula
Percentage change = [(3 - 609) / 609] x 100
Subtract the new number by the original number
3 - 609 = -606
-606 ÷ 609 = -0.9950738916256158
-0.9950738916256158 x 100 = -99.51%