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:
Doug Mitchell (film producer)
Table title:
Filmography
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Film </th><th colspan=1 rowspan=1 > Credit </th></tr>
<tr> <td colspan=1 rowspan=1 > 1984 </td><td colspan=1 rowspan=1 > Bodyline </td><td colspan=1 rowspan=1 > Executive Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1984 </td><td colspan=1 rowspan=1 > The Cowra Breakout </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1985 </td><td colspan=1 rowspan=1 > Mad Max Beyond Thunderdome </td><td colspan=1 rowspan=1 > Co-producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1985 </td><td colspan=1 rowspan=1 > The Making of Mad Max Beyond Thunderdome </td><td colspan=1 rowspan=1 > Co-producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1987 </td><td colspan=1 rowspan=1 > Vietnam </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1987 </td><td colspan=1 rowspan=1 > The Year My Voice Broke </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1987 </td><td colspan=1 rowspan=1 > The Riddle of the Stinson </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1988 </td><td colspan=1 rowspan=1 > The Dirtwater Dynasty </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1988 </td><td colspan=1 rowspan=1 > The Clean Machine </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1988 </td><td colspan=1 rowspan=1 > Fragments of War: The Story of Damien Parer </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1989 </td><td colspan=1 rowspan=1 > Dead Calm </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1989 </td><td colspan=1 rowspan=1 > Bangkok Hilton </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1991 </td><td colspan=1 rowspan=1 > Flirting </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1992 </td><td colspan=1 rowspan=1 > Lorenzo's Oil </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1995 </td><td colspan=1 rowspan=1 > Babe </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1996 </td><td colspan=1 rowspan=1 > Video Fool for Love </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1997 </td><td colspan=1 rowspan=1 > 40,000 Years of Dreaming </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 1998 </td><td colspan=1 rowspan=1 > Babe: Pig in the City </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2006 </td><td class="highlighted"  colspan=1 rowspan=1 > Happy Feet </td><td class="highlighted"  colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 2011 </td><td colspan=1 rowspan=1 > Happy Feet Two </td><td colspan=1 rowspan=1 > Producer </td></tr>
<tr> <td colspan=1 rowspan=1 > 2015 </td><td colspan=1 rowspan=1 > Mad Max: Fury Road </td><td colspan=1 rowspan=1 > Producer </td></tr>
</table>
Question:
How many Happy Feet films were produced?
Answer:
There are two Happy Feet films, first one produced in 2006 and second one in 2011.