Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Oscar Cortínez
Table title:
Achievements
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Competition </th><th colspan=1 rowspan=1 > Venue </th><th colspan=1 rowspan=1 > Position </th><th colspan=1 rowspan=1 > Event </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <th colspan=6 rowspan=1 > Representing Argentina </th></tr>
<tr> <td colspan=1 rowspan=2 > 1991 </td><td colspan=1 rowspan=2 > South American Junior Championships </td><td colspan=1 rowspan=2 > Asunción, Paraguay </td><td colspan=1 rowspan=1 > 3rd </td><td colspan=1 rowspan=1 > 1500 m </td><td colspan=1 rowspan=1 > 4:00.7 </td></tr>
<tr> <td colspan=1 rowspan=1 > 4th </td><td colspan=1 rowspan=1 > 5000 m </td><td colspan=1 rowspan=1 > 15:32.9 </td></tr>
<tr> <td colspan=1 rowspan=1 > 1992 </td><td colspan=1 rowspan=1 > World Junior Championships </td><td colspan=1 rowspan=1 > Seoul, South Korea </td><td colspan=1 rowspan=1 > 5th </td><td colspan=1 rowspan=1 > 10,000 m </td><td colspan=1 rowspan=1 > 29:31.80 </td></tr>
<tr> <td colspan=1 rowspan=2 > 1993 </td><td colspan=1 rowspan=1 > South American Cross Country Championships </td><td colspan=1 rowspan=1 > Cali, Colombia </td><td colspan=1 rowspan=1 > — </td><td colspan=1 rowspan=1 > 12 km </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > World Cross Country Championships </td><td colspan=1 rowspan=1 > Amorebieta, Spain </td><td colspan=1 rowspan=1 > 166th </td><td colspan=1 rowspan=1 > 11.75 km </td><td colspan=1 rowspan=1 > 36:24 </td></tr>
<tr> <td colspan=1 rowspan=1 > 1996 </td><td colspan=1 rowspan=1 > South American Cross Country Championships </td><td colspan=1 rowspan=1 > Asunción, Paraguay </td><td colspan=1 rowspan=1 > 12th </td><td colspan=1 rowspan=1 > 12 km </td><td colspan=1 rowspan=1 > 40:20 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2000 </td><td colspan=1 rowspan=1 > Olympic Games </td><td colspan=1 rowspan=1 > Sydney, Australia </td><td colspan=1 rowspan=1 > 58th </td><td colspan=1 rowspan=1 > Marathon </td><td colspan=1 rowspan=1 > 2:25:01 </td></tr>
<tr> <td colspan=1 rowspan=3 > 2001 </td><td colspan=1 rowspan=1 > South American Cross Country Championships </td><td colspan=1 rowspan=1 > Rio de Janeiro, Brazil </td><td colspan=1 rowspan=1 > 1st </td><td colspan=1 rowspan=1 > 4 km </td><td colspan=1 rowspan=1 > 11:25 </td></tr>
<tr> <td colspan=1 rowspan=2 > World Cross Country Championships </td><td colspan=1 rowspan=2 > Oostende, Belgium </td><td colspan=1 rowspan=1 > 47th </td><td colspan=1 rowspan=1 > 4.1 km </td><td colspan=1 rowspan=1 > 13:35 </td></tr>
<tr> <td colspan=1 rowspan=1 > — </td><td colspan=1 rowspan=1 > 12.3 km </td><td colspan=1 rowspan=1 > DNF </td></tr>
<tr> <td colspan=1 rowspan=3 > 2002 </td><td colspan=1 rowspan=1 > South American Half Marathon Championships </td><td colspan=1 rowspan=1 > Buenos Aires, Argentina </td><td colspan=1 rowspan=1 > 1st </td><td colspan=1 rowspan=1 > Half marathon </td><td colspan=1 rowspan=1 > 1:05:40 </td></tr>
<tr> <td colspan=1 rowspan=2 > World Cross Country Championships </td><td colspan=1 rowspan=2 > Dublin, Ireland </td><td colspan=1 rowspan=1 > 101st </td><td colspan=1 rowspan=1 > 4.208 km </td><td colspan=1 rowspan=1 > 13:37 </td></tr>
<tr> <td colspan=1 rowspan=1 > 109th </td><td colspan=1 rowspan=1 > 11.998 km </td><td colspan=1 rowspan=1 > 39:03 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2003 </td><td class="highlighted"  colspan=1 rowspan=1 > Buenos Aires Marathon </td><td colspan=1 rowspan=1 > Buenos Aires, Argentina </td><td class="highlighted"  colspan=1 rowspan=1 > 1st </td><td colspan=1 rowspan=1 > Marathon </td><td colspan=1 rowspan=1 > 2:17:50 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2004 </td><td class="highlighted"  colspan=1 rowspan=1 > Buenos Aires Marathon </td><td colspan=1 rowspan=1 > Buenos Aires, Argentina </td><td class="highlighted"  colspan=1 rowspan=1 > 1st </td><td colspan=1 rowspan=1 > Marathon </td><td colspan=1 rowspan=1 > 2:21:22 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2009 </td><td colspan=1 rowspan=1 > South American Marathon Championships </td><td colspan=1 rowspan=1 > Buenos Aires, Argentina </td><td colspan=1 rowspan=1 > 2nd </td><td colspan=1 rowspan=1 > Marathon </td><td colspan=1 rowspan=1 > 2:20:06 </td></tr>
</table>
Question:
In what competition was Oscar Cortínez the winner in 2003 and 2004?
Answer:
Oscar Cortínez was the winner of the Buenos Aires Marathon in 2003 and 2004.