\begin{axis}[
    axis y line=center,
    width=7cm,
    height=13cm,
    ymode=log,
    grid=both,
    grid style={thick},
    ymin = 10000,
    ymax = 50000,
    log ticks with fixed point,
    ytick={10000, 20000, 30000, 40000, 50000},
    enlarge y limits,
    xticklabel style={rotate=45},
    x tick label style={
      /pgf/number format/.cd,
      1000 sep={},
      /tikz/.cd
    },
    xmin=1991,
    xmax=2013,
    xlabel={Année},
    ylabel={Salaire net annuel moyen (euros)},
    x label style={at={(axis description cs:1,0.05)},anchor=south east},
    y label style={at={(axis description cs:0,1)},anchor=north west},
    legend style={at={(axis cs:2007,32500)}},
  ]
  \addplot table[x=annee,y=cadres] {insee-salaires.data};
  \addlegendentry{Cadres};
  \addplot table[x=annee,y=ouvriers] {insee-salaires.data};
  \addlegendentry{Ouvriers};
\end{axis}