\begin{axis}[
    axis x line=center,
    axis y line=center,
    grid=both,
    grid style={thick},
    ymin = 0,
    x=7.5,
    y=.0065,
    x tick label style={
      /pgf/number format/.cd,
      1000 sep={},
      /tikz/.cd
    },
    y tick label style={
      /pgf/number format/.cd,
      1000 sep={\,},
      scaled y ticks=false,
      /tikz/.cd
    },
    ymax = 50000,
    xticklabel style={rotate=45},
    xmin=1991,
    xmax=2013,
    ylabel={Salaire net annuel moyen (euros)},
    xlabel={Année},
    x label style={at={(axis description cs:1,0)},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}