@data = ( [ '1-1-2004', 15.0 ],
     [ '2-1-2004', 15.5 ],
     [ '3-1-2004', 16.5 ],
     [ '4-1-2004', 17.0 ],
     [ '5-1-2004', 17.5 ],
     [ '6-1-2004', 18.0 ],
     [ '7-1-2004', 18.5 ],
     [ '8-1-2004', 19.0 ],
     [ '9-1-2004', 19.5 ],
     ...
      [ '16-1-2004', 28.8 ]);