Answer
See explanation below.
Work Step by Step
A function of the form $y=A\log_{b}t+C$, with positive coefficients A and C, is an always rising function, but it has a value $t_{0}$ for which $y=0.$
Left of that (for values lower than $t_{0}$), the graph is below the x-axis, meaning that negative values can be obtained for y.
Owning $-23\%$ of the market makes no sense, so backward extrapolation is not appropriate.
