%% 
%%  A DANTE-Edition example
%% 
%%  Example 30-04-1 on page 602.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}
\usepackage{filecontents}
\begin{filecontents*}{demo2.dat}
  1989 3.08  1990 3.84 1991 4.08  1992 3.21  1993 5.23  1994 2.97
  1995 2.53  1996 2.8  1997 2.78  1998 3.15  1999 2.32  2000 2.4   2001 2.46
\end{filecontents*}
\begin{filecontents*}{demo3.dat}
  1989 3.08 1990 3.1  1991 3.08  1992 3.21  1993 5.0  1994 2.27  1995 3.53
  1996 3.8  1997 2.8  1998 4.15  1999 3.32  2000 1.4  2001 2.46
\end{filecontents*}


\usepackage{pstricks-add}

\begin{document}
\readdata{\data}{demo2.dat}\readdata{\dataII}{demo3.dat}
\pstScalePoints(1,1){1989 sub}{}
\psset{llx=-0.5cm,lly=-0.5cm, xAxisLabel=Year,yAxisLabel=Whatever,
     xAxisLabelPos={2in,-0.3in},yAxisLabelPos={-0.3in,1in}}
\psgraph[axesstyle=frame,Dx=2,Ox=1989,subticks=2](0,0)(12,6){4in}{2in}
  \listplot[linecolor=red,linewidth=2pt]{\data}
  \listplot[linecolor=blue,linewidth=2pt]{\dataII}
  \listplot[linecolor=cyan,linewidth=2pt,yunit=0.5]{\dataII}
\endpsgraph
\end{document}