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One option with simple code is to use talltblr of tabularray package and at table footnote explain that with "China" is considered Continental China:
\documentclass[twocolumn]{article}
%---------------- show page layout. don't use in a real document!
\usepackage{showframe}
\renewcommand\ShowFrameLinethickness{0.15pt}
\renewcommand*\ShowFrameColor{\color{red}}
%---------------------------------------------------------------%
\usepackage{tabularray}
\begin{document}
\begin{table}
\centering
\begin{talltblr}[
caption = {Some Typical Commands},
label = {tab:?},
note{a} = {Continental China}
]{hlines, vlines,
colspec = { l {9}{c}}
}
\SetCell[r=2]{c} Années
& \SetCell[c=3]{c} {Utilisateurs Internet\(en millions)}
& & & \SetCell[c=3]{c} {Utilisateurs Internet mobile\(en millions)}
& & & \SetCell[c=3]{c} {Utilisateurs en zones\rurales (en %)}
& & \
& China\TblrNote{a} & Hongkong & Macao
& China\TblrNote{a} & Hongkong & Macao
& China\TblrNote{a} & Hongkong & Macao \
2007 & 210 & 4.5 & 0.2
& 50 & 10.8 & 0.8
& N/D & 0 & 0 \
2008 & 298 & 4.7 & 0.3
& 118 & 11.6 & 0.9
& 28.4 & 0 & 0 \
2009 & 384 & 4.8 & 0.3
& 233 & 12.6 & 1
& 27.8 & 0 & 0 \
2010 & 457 & 5.1 & 0.3
& 303 & 13.8 & 1.1
& 27.3 & 0 & 0 \
2011 & 513 & 5.1 & 0.3
& 356 & 15.3 & 1.4
& 26.5 & 0 & 0 \
2012 & 564 & 5.2 & 0.4
& 420 & 16.4 & 1.6
& 27.6 & 0 & 0 \
\end{talltblr}
\end{table*}
\end{document}
Edit:
Regarding to you comment, you can abbreviate "Hongkong" to HK too. With this the width of table further shrink and make a space to make all last nine columns equal width by use of X[c] column type insead c:
\documentclass[twocolumn]{article}
%---------------- show page layout. don't use in a real document!
\usepackage{showframe}
\renewcommand\ShowFrameLinethickness{0.15pt}
\renewcommand*\ShowFrameColor{\color{red}}
%---------------------------------------------------------------%
\usepackage{tabularray}
\begin{document}
\begin{table}
\centering
\begin{talltblr}[
caption = {Some Typical Commands},
label = {tab:?},
note{a} = {Continental China},
note{b} = {Hongkong}
]{hlines, vlines,
colspec = { l {9}{X[c]}}
}
\SetCell[r=2]{c} Années
& \SetCell[c=3]{c} {Utilisateurs Internet\(en millions)}
& & & \SetCell[c=3]{c} {Utilisateurs Internet mobile\(en millions)}
& & & \SetCell[c=3]{c} {Utilisateurs en zones\rurales (en %)}
& & \
& China\TblrNote{a} & HK\TblrNote{b} & Macao
& China\TblrNote{a} & HK\TblrNote{b} & Macao
& China\TblrNote{a} & HK\TblrNote{b} & Macao \
2007 & 210 & 4.5 & 0.2
& 50 & 10.8 & 0.8
& N/D & 0 & 0 \
2008 & 298 & 4.7 & 0.3
& 118 & 11.6 & 0.9
& 28.4 & 0 & 0 \
2009 & 384 & 4.8 & 0.3
& 233 & 12.6 & 1
& 27.8 & 0 & 0 \
2010 & 457 & 5.1 & 0.3
& 303 & 13.8 & 1.1
& 27.3 & 0 & 0 \
2011 & 513 & 5.1 & 0.3
& 356 & 15.3 & 1.4
& 26.5 & 0 & 0 \
2012 & 564 & 5.2 & 0.4
& 420 & 16.4 & 1.6
& 27.6 & 0 & 0 \
\end{talltblr}
\end{table*}
\end{document}

landscapeenviroment, of thepdflscapepackage to put the table in a landscape page. – Mane32 Apr 20 '23 at 18:20