-99.84% is the change from 609 to 1
Calculation steps:
[( 1 - 609 ) ÷ 609] x 100 = -99.84%
Formula
Percentage change = [(1 - 609) / 609] x 100
Subtract the new number by the original number
1 - 609 = -608
-608 ÷ 609 = -0.9983579638752053
-0.9983579638752053 x 100 = -99.84%