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:
Mad Men
Table title:
Ratings
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=2 > Season </th><th colspan=1 rowspan=2 > Timeslot (ET) </th><th colspan=1 rowspan=2 > Episodes </th><th colspan=2 rowspan=1 > Premiered </th><th colspan=2 rowspan=1 > Ended </th><th colspan=1 rowspan=2 > Average 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> <th colspan=1 rowspan=1 > Season 1 </th><td colspan=1 rowspan=1 > Thursday 10:00 pm </td><td colspan=1 rowspan=1 > 13 </td><td colspan=1 rowspan=1 > July 19, 2007 </td><td colspan=1 rowspan=1 > 1.65 </td><td colspan=1 rowspan=1 > October 18, 2007 </td><td colspan=1 rowspan=1 > 0.93 </td><td colspan=1 rowspan=1 > 0.90 </td></tr>
<tr> <th colspan=1 rowspan=1 > Season 2 </th><td colspan=1 rowspan=7 > Sunday 10:00 pm </td><td colspan=1 rowspan=1 > 13 </td><td colspan=1 rowspan=1 > July 27, 2008 </td><td colspan=1 rowspan=1 > 2.06 </td><td colspan=1 rowspan=1 > October 26, 2008 </td><td colspan=1 rowspan=1 > 1.75 </td><td colspan=1 rowspan=1 > 1.52 </td></tr>
<tr> <th colspan=1 rowspan=1 > Season 3 </th><td colspan=1 rowspan=1 > 13 </td><td colspan=1 rowspan=1 > August 16, 2009 </td><td colspan=1 rowspan=1 > 2.76 </td><td colspan=1 rowspan=1 > November 8, 2009 </td><td colspan=1 rowspan=1 > 2.32 </td><td colspan=1 rowspan=1 > 1.80 </td></tr>
<tr> <th colspan=1 rowspan=1 > Season 4 </th><td colspan=1 rowspan=1 > 13 </td><td colspan=1 rowspan=1 > July 25, 2010 </td><td colspan=1 rowspan=1 > 2.90 </td><td colspan=1 rowspan=1 > October 17, 2010 </td><td colspan=1 rowspan=1 > 2.44 </td><td colspan=1 rowspan=1 > 2.27 </td></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > Season 5 </th><td colspan=1 rowspan=1 > 13 </td><td colspan=1 rowspan=1 > March 25, 2012 </td><td colspan=1 rowspan=1 > 3.54 </td><td colspan=1 rowspan=1 > June 10, 2012 </td><td colspan=1 rowspan=1 > 2.70 </td><td colspan=1 rowspan=1 > 2.61 </td></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > Season 6 </th><td colspan=1 rowspan=1 > 13 </td><td colspan=1 rowspan=1 > April 7, 2013 </td><td colspan=1 rowspan=1 > 3.37 </td><td colspan=1 rowspan=1 > June 23, 2013 </td><td colspan=1 rowspan=1 > 2.69 </td><td class="highlighted"  colspan=1 rowspan=1 > 2.49 </td></tr>
<tr> <th colspan=1 rowspan=1 > Season 7, Part 1 </th><td colspan=1 rowspan=1 > 7 </td><td colspan=1 rowspan=1 > April 13, 2014 </td><td colspan=1 rowspan=1 > 2.27 </td><td colspan=1 rowspan=1 > May 25, 2014 </td><td colspan=1 rowspan=1 > 1.94 </td><td colspan=1 rowspan=1 > 2.01 </td></tr>
<tr> <th colspan=1 rowspan=1 > Season 7, Part 2 </th><td colspan=1 rowspan=1 > 7 </td><td colspan=1 rowspan=1 > April 5, 2015 </td><td colspan=1 rowspan=1 > 2.27 </td><td colspan=1 rowspan=1 > May 17, 2015 </td><td colspan=1 rowspan=1 > 3.29 </td><td colspan=1 rowspan=1 > 2.12 </td></tr>
</table>
Question:
How many viewers on average did Mad Men have in Season 6, and how did that compare to the viewer average in Season 5?
Answer:
In Mad Men, the season average was 2.49 million viewers, down from the season five average.