-99.01% is the change from 609 to 6
Calculation steps:
[( 6 - 609 ) ÷ 609] x 100 = -99.01%
Formula
Percentage change = [(6 - 609) / 609] x 100
Subtract the new number by the original number
6 - 609 = -603
-603 ÷ 609 = -0.9901477832512315
-0.9901477832512315 x 100 = -99.01%