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:
List of awards and nominations received by Patricia Clarkson
Table title:
Primetime Emmy Awards
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Nominated work </th><th colspan=1 rowspan=1 > Category </th><th colspan=1 rowspan=1 > Result </th><th colspan=1 rowspan=1 > Ref. </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2002 </td><td class="highlighted"  colspan=1 rowspan=2 > Six Feet Under </td><td class="highlighted"  colspan=1 rowspan=2 > Outstanding Guest Actress in a Drama Series </td><td class="highlighted"  colspan=1 rowspan=1 > Won </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2006 </td><td class="highlighted"  colspan=1 rowspan=1 > Won </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
What years did Clarkson earn her primetime Emmy Awards for Outstanding Guest  Actress in a Drama Series for her performance on Six Feet Under?
Answer:
On television, Clarkson earned two Primetime Emmy Awards for Outstanding Guest Actress in a Drama Series for her performance on Six Feet Under, in 2002 and 2006.