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:
Smallville
Table title:
Nielsen rankings
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=2 > Season </th><th colspan=1 rowspan=2 > Timeslot (ET/PT) </th><th colspan=1 rowspan=2 > Network </th><th colspan=2 rowspan=1 > Premiered </th><th colspan=2 rowspan=1 > Ended </th><th colspan=1 rowspan=2 > Rank </th><th colspan=1 rowspan=2 > Viewers (in millions) </th></tr>
<tr> <th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > Premiere Viewers (in millions) </th><th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > Finale viewers (in millions) </th></tr>
<tr> <td colspan=1 rowspan=1 > 1 (2001–02) </td><td colspan=1 rowspan=2 > Tuesday 9/8C </td><td colspan=1 rowspan=5 > The WB </td><td colspan=1 rowspan=1 > October 16, 2001 </td><td colspan=1 rowspan=1 > 8.40 </td><td colspan=1 rowspan=1 > May 21, 2002 </td><td colspan=1 rowspan=1 > 6.00 </td><td colspan=1 rowspan=1 > 115 </td><td colspan=1 rowspan=1 > 5.90 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2 (2002–03) </td><td colspan=1 rowspan=1 > September 24, 2002 </td><td colspan=1 rowspan=1 > 8.70 </td><td colspan=1 rowspan=1 > May 20, 2003 </td><td colspan=1 rowspan=1 > 7.50 </td><td colspan=1 rowspan=1 > 113 </td><td class="highlighted"  colspan=1 rowspan=1 > 6.30 </td></tr>
<tr> <td colspan=1 rowspan=1 > 3 (2003–04) </td><td colspan=1 rowspan=2 > Wednesday 8/7C </td><td colspan=1 rowspan=1 > October 1, 2003 </td><td colspan=1 rowspan=1 > 6.80 </td><td colspan=1 rowspan=1 > May 19, 2004 </td><td colspan=1 rowspan=1 > 5.92 </td><td colspan=1 rowspan=1 > 141 </td><td colspan=1 rowspan=1 > 4.96 </td></tr>
<tr> <td colspan=1 rowspan=1 > 4 (2004–05) </td><td colspan=1 rowspan=1 > September 22, 2004 </td><td colspan=1 rowspan=1 > 6.07 </td><td colspan=1 rowspan=1 > May 18, 2005 </td><td colspan=1 rowspan=1 > 5.47 </td><td colspan=1 rowspan=1 > 124 </td><td colspan=1 rowspan=1 > 4.40 </td></tr>
<tr> <td colspan=1 rowspan=1 > 5 (2005–06) </td><td colspan=1 rowspan=4 > Thursday 8/7C </td><td colspan=1 rowspan=1 > September 29, 2005 </td><td colspan=1 rowspan=1 > 5.90 </td><td colspan=1 rowspan=1 > May 11, 2006 </td><td colspan=1 rowspan=1 > 4.85 </td><td colspan=1 rowspan=1 > 117 </td><td colspan=1 rowspan=1 > 4.70 </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 (2006–07) </td><td colspan=1 rowspan=5 > The CW </td><td colspan=1 rowspan=1 > September 28, 2006 </td><td colspan=1 rowspan=1 > 4.96 </td><td colspan=1 rowspan=1 > May 17, 2007 </td><td colspan=1 rowspan=1 > 4.14 </td><td colspan=1 rowspan=1 > 125 </td><td colspan=1 rowspan=1 > 4.10 </td></tr>
<tr> <td colspan=1 rowspan=1 > 7 (2007–08) </td><td colspan=1 rowspan=1 > September 27, 2007 </td><td colspan=1 rowspan=1 > 5.18 </td><td colspan=1 rowspan=1 > May 15, 2008 </td><td colspan=1 rowspan=1 > 3.85 </td><td colspan=1 rowspan=1 > 175 </td><td colspan=1 rowspan=1 > 3.77 </td></tr>
<tr> <td colspan=1 rowspan=1 > 8 (2008–09) </td><td colspan=1 rowspan=1 > September 18, 2008 </td><td colspan=1 rowspan=1 > 4.34 </td><td colspan=1 rowspan=1 > May 14, 2009 </td><td colspan=1 rowspan=1 > 3.13 </td><td colspan=1 rowspan=1 > 152 </td><td colspan=1 rowspan=1 > 3.74 </td></tr>
<tr> <td colspan=1 rowspan=1 > 9 (2009–10) </td><td colspan=1 rowspan=2 > Friday 8/7C </td><td colspan=1 rowspan=1 > September 25, 2009 </td><td colspan=1 rowspan=1 > 2.58 </td><td colspan=1 rowspan=1 > May 14, 2010 </td><td colspan=1 rowspan=1 > 2.45 </td><td colspan=1 rowspan=1 > 129 </td><td colspan=1 rowspan=1 > 2.38 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 10 (2010–11) </td><td colspan=1 rowspan=1 > September 24, 2010 </td><td colspan=1 rowspan=1 > 2.98 </td><td colspan=1 rowspan=1 > May 13, 2011 </td><td colspan=1 rowspan=1 > 3.02 </td><td colspan=1 rowspan=1 > 131 </td><td colspan=1 rowspan=1 > 3.19 </td></tr>
</table>
Question:
Which season of Smallville performed the best during it's airing? 
Answer:
Over ten seasons the Smallville averaged, million viewers per episode, is with season two's highest rating of 6.3 million.