\begin{tabular}{lrrrrrrrrr}
\toprule
Density & $k=1$ & $k=3$ & $k=5$ & $k=7$ & $k=10$ & $k=15$ & $k=20$ & $k=30$ & $k=50$ \\
\midrule
$<5$ & 31.3 & 26.9 & 25.3 & 24.4 & 24.1 & 23.7 & 23.8 & \textbf{23.6} & 23.7 \\
5--19 & 25.4 & 21.6 & 20.4 & 19.6 & 19.1 & 18.7 & 18.4 & 18.4 & \textbf{18.2} \\
20--49 & 20.1 & 16.6 & 15.4 & 14.9 & 14.5 & 14.3 & 14.1 & 14.1 & \textbf{13.9} \\
50--199 & 14.7 & 12.2 & 11.5 & 11.2 & 11.0 & 10.9 & \textbf{10.9} & \textbf{10.9} & 10.9 \\
$\ge 200$ & 12.9 & 10.8 & 10.2 & 9.9 & 9.7 & 9.6 & 9.6 & \textbf{9.6} & 9.7 \\
\bottomrule
\end{tabular}