% generated by tables/make_tables.py from ./results/bibliometrics/countries_yearly.csv
\begin{table}[htbp]\centering\caption{Concentration of output across countries by year, and the two largest producers under full counting.}\label{tab:country_concentration}
\begin{threeparttable}\small
\begin{tabular}{lrrrrrrrrr}
\toprule
\textbf{Year} & \textbf{Works} & \textbf{Countries} & \textbf{HHI} & \textbf{Top-5 (\%)} & \textbf{Top-10 (\%)} & \textbf{CN works (\%)} & \textbf{US works (\%)} & \textbf{CN full/frac} & \textbf{US full/frac} \\
\midrule
2018 & 433{,}475 & 196 & 0.0717 & 48.1 & 63.3 & 21.21 & 19.24 & 1.190 & 1.257 \\
2019 & 480{,}052 & 195 & 0.0763 & 48.7 & 63.7 & 23.28 & 18.92 & 1.186 & 1.259 \\
2020 & 506{,}990 & 203 & 0.0772 & 49.4 & 63.6 & 23.85 & 18.67 & 1.193 & 1.269 \\
2021 & 558{,}396 & 202 & 0.0827 & 51.0 & 64.5 & 25.80 & 17.17 & 1.166 & 1.274 \\
2022 & 581{,}511 & 204 & 0.0900 & 53.1 & 66.2 & 27.88 & 15.64 & 1.152 & 1.273 \\
2023 & 650{,}807 & 204 & 0.0936 & 54.7 & 67.1 & 28.55 & 15.00 & 1.146 & 1.274 \\
2024 & 727{,}907 & 206 & 0.0997 & 56.3 & 68.2 & 29.75 & 14.83 & 1.142 & 1.268 \\
2025 & 786{,}380 & 210 & 0.1005 & 56.5 & 67.7 & 30.24 & 14.13 & 1.146 & 1.284 \\
2026 & 630{,}222 & 207 & 0.0955 & 55.9 & 67.1 & 28.72 & 16.23 & 1.159 & 1.252 \\
\bottomrule
\end{tabular}
\begin{tablenotes}\footnotesize\item Works: fractional total of works with at least one country; Countries: number of countries with any output; HHI: Herfindahl--Hirschman index of fractional country shares; Top-5/Top-10: fractional share of the five and ten largest countries. CN/US works: share of works with at least one author in the country among works with a country (full counting); CN/US full/frac: ratio of the country's full count to its fractional count, which exceeds one by the extent to which its works are co-authored with other countries.\end{tablenotes}
\end{threeparttable}\end{table}