\documentclass[12pt]{article}

\usepackage{filecontents}
\begin{filecontents*}{demo0.dat}
    0.1414    0.0052
    0.2828    0.0217
    0.4243    0.0480
    0.5657    0.0890
    0.7071    0.1375
    0.8485    0.1906
    0.9899    0.2663
    1.1314    0.3580
    1.2728    0.4644
    1.4142    0.5801
    1.5556    0.7033
    1.6971    0.8899
    1.8385    1.1143
    1.9799    1.2593
    2.1213    1.5692
    2.2627    3.2331
    2.4042    4.4097
    2.5456    5.8186
    2.6870    7.4441
    2.8284    8.2287
\end{filecontents*}

\begin{filecontents*}{demo1.dat}
1 99447169
2 110351058
3 123557238
4 138346129
5 145050826
6 160363212
7 174000394
8 183856559
9 189128691
10 197634845
11 213257357
12 216899512
13 230152738
14 224144907
15 247410024
16 261168438
17 252920343
18 326153799
19 319442110
20 310351522
21 381919943
22 438043888
23 357527766
24 603304997
\end{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[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{lmodern}
%\usepackage[scaled]{luximono}
\usepackage[lmargin=2.5cm]{geometry}
\usepackage{tabularx}
\usepackage{url}
\usepackage{graphicx}
\usepackage{pstricks}
\usepackage{framed}
\usepackage{pstricks-add}
\let\pstricksaddFV\fileversion
\usepackage{pst-example}
\usepackage{longtable}
\usepackage{pifont}
\usepackage{amsmath}
\def\textat{\protect\makeatletter\texttt{@}\protect\makeatother}
\let\psEllipticArc\psellipticarc
\let\psEllipticArcN\psellipticarcn
\let\psWedgeEllipse\psellipticwedge
\usepackage[colorlinks,linktocpage]{hyperref}
\usepackage{url}
%\def\UrlFont{\small\ttfamily}
\makeatletter
\def\verbatim@font{\small\normalfont\ttfamily}
\makeatother
%\parindent=0pt
\newcommand\verbI[1]{{\small\texttt{#1}}}
\newcommand\CMD[1]{{\texttt{\textbackslash#1}}}
%
\newcommand{\pstEllipse}[5][]{%
  \psset{#1}
  \parametricplot{#4}{#5}{#2\space t cos mul #3\space t sin mul}%
}
%
\newcommand{\pstEllipseWedge}[5][]{%
  \psset{#1}
  \pscustom{%
    \parametricplot{#4}{#5}{#2\space t cos mul #3\space t sin mul}%
    \psline(! #2\space #5\space cos mul #3\space #5\space sin mul)%
       (0,0)%
       (! #2\space #4\space cos mul #3\space #4\space sin mul)%
  }%
}
%
\psset{subgriddiv=0,griddots=5,gridlabels=7pt}
%
\DeclareRobustCommand\cs[1]{\texttt{\char`\\#1}}
\def\PS{PostScript}
%
%\renewcommand{\ttdefault}{ul9}% Luxi Mono

\parindent=0pt
\parskip=1ex plus 5pt
\begin{document}
\input{pstricks-add-doc}
\end{document}

