\begin{filecontents*}{GDP.csv}
Jahr,Total,Jung,Mittel,Alt
1990-01-01,2.5,4.9,2.2,1.6
1991-01-01,4.3,9.9,3.2,3.1
1992-01-01,5.3,10.0,4.3,4.4
1993-01-01,5.3,11.5,4.2,4.0
1994-01-01,4.9,11.0,3.7,3.5
1995-01-01,3.7,8.4,2.6,3.7
1996-01-01,3.9,7.7,3.0,3.7
1997-01-01,2.7,6.0,2.1,2.0
1998-01-01,2.0,4.4,1.4,2.0
1999-01-01,2.3,4.7,1.7,2.0
2000-01-01,2.3,4.8,1.7,1.6
2001-01-01,3.3,7.2,2.7,1.9
2002-01-01,3.3,8.2,2.5,1.9
2003-01-01,3.1,8.1,2.0,2.5
2004-01-01,2.6,7.2,1.7,1.3
2005-01-01,2.9,8.2,1.8,1.5
2006-01-01,2.3,7.1,1.3,1.1
2007-01-01,3.0,8.2,2.0,1.6
2008-01-01,7.2,16.0,6.1,3.4
2009-01-01,7.6,16.2,6.3,4.2
2010-01-01,7.1,14.6,5.6,5.2
2011-01-01,6.0,13.6,4.6,4.1
2012-01-01,5.4,10.7,4.6,3.2
2013-01-01,5.0,10.0,4.3,2.8
2014-01-01,4.0,8.7,3.2,2.6
2015-01-01,3.0,6.5,2.5,1.8
2016-01-01,2.5,4.9,2.2,1.6
\end{filecontents*}\documentclass[tikz]{standalone}\usepackage{pgfplots}\usepgfplotslibrary{dateplot}\usepackage[main=ngerman,icelandic,danish,frenchb]{babel}\usepackage[T1]{fontenc}\usepackage[utf8]{inputenc}\usepackage[oldstyle,sflining]{libertine}\begin{document}\sffamily\begin{tikzpicture}% \sffamily\begin{axis}[
date ZERO=1990-01-01,
date coordinates in=x,
no marks,
width=12cm,
height=6cm,
enlargelimits=false,
xticklabel={\tiny\year},
xticklabel style={rotate=45,anchor=north east},
xtick={1990-01-01,1991-01-01,1992-01-01,1993-01-01,1994-01-01,1995-01-01,1996-01-01,1997-01-01,1998-01-01,1999-01-01,2000-01-01,2001-01-01,2002-01-01,2003-01-01,2004-01-01,2005-01-01,2006-01-01,2007-01-01,2008-01-01,2009-01-01,2010-01-01,2011-01-01,2012-01-01,2013-01-01,2014-01-01,2015-01-01,2016-01-01},
xtick pos=left,
xtick align=outside,
cycle multi list={mark list\nextlist color list},
ymin=-0,ymax=17,
ytick={0,1,2,3,4,...,17},
yticklabel={\tiny\pgfmathprintnumber[verbatim]{\tick}\%},
ytick style={draw=none},
yticklabel pos=right,
ymajorgrids=true,
legend style={
draw=none,
legend cell align=left,
at={(0,1.05)},% <-
anchor=south west,% <-
legend image code/.code={\filldraw[##1] (-.5ex,-.5ex) rectangle (1ex,1ex);
},
},
legend columns=-1% <-
]
\addplot table[col sep=comma,x=Jahr,y={Total}] {GDP.csv};
\addlegendentry{Total};
\addplot table[col sep=comma,x=Jahr,y={Jung}] {GDP.csv};
\addlegendentry{16--24};
\addplot table[col sep=comma,x=Jahr,y={Mittel}] {GDP.csv};
\addlegendentry{25--54};
\addplot table[col sep=comma,x=Jahr,y={Alt}] {GDP.csv};
\addlegendentry{55-74};
\end{axis}\end{tikzpicture}\end{document}
