-99.5% is the change from 199 to 1
Calculation steps:
[( 1 - 199 ) ÷ 199] x 100 = -99.5%
Formula
Percentage change = [(1 - 199) / 199] x 100
Subtract the new number by the original number
1 - 199 = -198
-198 ÷ 199 = -0.9949748743718593
-0.9949748743718593 x 100 = -99.5%