\begin{table}[htbp]\centering
\caption{Robust IV Estimates of Log Registration on Log Registrations per Capita on Log VMT per Capita \label{tab:VMTPerCapitaiv}}
\begin{tabular}{l*{4}{c}}
\hline \hline \multicolumn{5}{l}{\textit{Panel A: IV Estimates and Robust 95\% Confidence Intervals}} \\&            &            &            &            \\
\multicolumn{5}{c}{Dep. Var.: Log Number of Vehicle Registrations} \\ &         (1)&         (2)&         (3)&         (4)\\
$\beta$     &      -0.626&       -0.70&       -0.55&       -0.61\\
95\% Conf. Set&\makecell{(-$\infty$, $0.49]$; \nextline $[32.63$, $\infty$)}&\makecell{(-$\infty$, $0.56]$; \nextline $[28.03$, $\infty$)}&[-8.30, 0.64]&(-$\infty$, $\infty$)\\
\makecell[l]{Data Source \nextline Controls}&        None&  Documented&\makecell{Large \nextline Undocumented}&\makecell{Small \nextline Undocumented}\\
State Fixed Effects&           Y&           Y&           Y&           Y\\
Year Fixed Effects&           Y&           Y&           Y&           Y\\
\makecell[l]{State-Specific Linear \\ Time Trends}&           Y&           Y&           Y&           Y\\
Common Controls&           Y&           Y&           Y&           Y\\
Number of Obs.&       2,424&       2,424&       2,424&       2,424\\
\hline \hline \multicolumn{5}{l}{\textit{Panel B: Anderson-Robin Test Statistics and P-Values}} \\&            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=1.6$}} \\ AR Stat&    6.736***&     6.495**&     6.374**&       2.260\\
p-value     &       0.009&       0.011&       0.012&       0.133\\
            &            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=1$}} \\ AR Stat&     6.168**&     5.675**&     5.257**&       1.953\\
p-value     &       0.013&       0.017&       0.022&       0.162\\
            &            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=0.3$}} \\ AR Stat&       2.662&       2.439&       2.149&       0.899\\
p-value     &       0.103&       0.118&       0.143&       0.343\\
            &            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=0$}} \\ AR Stat&       1.090&       1.081&       0.868&       0.399\\
p-value     &       0.296&       0.298&       0.352&       0.528\\
            &            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=-2.5$}} \\ AR Stat&       1.349&       1.180&       1.999&       0.657\\
p-value     &       0.245&       0.277&       0.157&       0.417\\
\hline \hline \end{tabular} \vspace{0.2cm} \begin{tablenotes} \begin{spacing}{0} \begin{footnotesize} \item \textbf{Notes:} The top panel of this table presents IV estimates and 95\% confidence sets robust to weak instruments of the linear relationship between log vehicle-miles travelled (VMT) per capita and log vehicle registrations per capita.  The bottom panel presents Anderson-Rubin chi-squared statistics along with p-values for different null hypotheses pertaining to the parameter estimated in the top panel.  The unit of observation is state-year. The four specifications pertaining to different levels of  (DSCs) and control specifications are documented in Table \cref{ssec:Spec}. Confidence sets are based on standard errors clustered by state. * p\textless 0.1, ** p\textless 0.05, *** p\textless 0.01 \end{footnotesize} \end{spacing} \end{tablenotes} \end{table}
