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:
Glen Keane
Table title:
Filmography
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Title </th><th colspan=1 rowspan=1 > Credits </th><th colspan=1 rowspan=1 > Characters </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <td colspan=1 rowspan=4 > 1973 </td><td colspan=1 rowspan=1 > My Favorite Martians </td><td colspan=1 rowspan=1 > Layout Artist </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > TV series by Filmation </td></tr>
<tr> <td colspan=1 rowspan=1 > Star Trek: The Animated Series </td><td colspan=1 rowspan=1 > Layout Artist </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > TV series by Filmation </td></tr>
<tr> <td colspan=1 rowspan=1 > Lassie's Rescue Rangers </td><td colspan=1 rowspan=1 > Layout Artist </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > TV series by Filmation </td></tr>
<tr> <td colspan=1 rowspan=1 > Mission: Magic! </td><td colspan=1 rowspan=1 > Layout Artist </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > TV series by Filmation </td></tr>
<tr> <td colspan=1 rowspan=2 > 1977 </td><td colspan=1 rowspan=1 > The Rescuers </td><td colspan=1 rowspan=1 > Character Animator </td><td colspan=1 rowspan=1 > Bernard and Penny </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Pete's Dragon </td><td colspan=1 rowspan=1 > Character Animator </td><td colspan=1 rowspan=1 > Elliott the Dragon </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1979 </td><td colspan=1 rowspan=1 > A Family Circus Christmas (TV Movie short) </td><td colspan=1 rowspan=1 > Animator / Models </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1981 </td><td colspan=1 rowspan=1 > The Fox and the Hound </td><td colspan=1 rowspan=1 > Supervising Animator </td><td colspan=1 rowspan=1 > The Bear </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1983 </td><td colspan=1 rowspan=1 > Mickey's Christmas Carol (Short) </td><td colspan=1 rowspan=1 > Animator </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1985 </td><td colspan=1 rowspan=1 > The Black Cauldron </td><td colspan=1 rowspan=1 > Character Animator </td><td colspan=1 rowspan=1 > Gurgi and Princess Eilonwy </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1986 </td><td colspan=1 rowspan=1 > The Great Mouse Detective </td><td colspan=1 rowspan=1 > Supervising Animator </td><td colspan=1 rowspan=1 > Professor Ratigan </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1987 </td><td colspan=1 rowspan=1 > The Chipmunk Adventure </td><td colspan=1 rowspan=1 > Animator / Storyboard Artist </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1988 </td><td colspan=1 rowspan=1 > Oliver & Company </td><td colspan=1 rowspan=1 > Character Designer / Supervising Animator </td><td colspan=1 rowspan=1 > Sykes, Georgette, Fagin, and Jenny Foxworth </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1989 </td><td class="highlighted"  colspan=1 rowspan=1 > The Little Mermaid </td><td class="highlighted"  colspan=1 rowspan=1 > Character Designer / Supervising Animator </td><td class="highlighted"  colspan=1 rowspan=1 > Ariel </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1990 </td><td class="highlighted"  colspan=1 rowspan=1 > The Rescuers Down Under </td><td colspan=1 rowspan=1 > Storyboard Artist / Supervising Animator / Character Designer / Visual Development </td><td class="highlighted"  colspan=1 rowspan=1 > Marahute </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1991 </td><td colspan=1 rowspan=1 > Beauty and the Beast </td><td colspan=1 rowspan=1 > Supervising Animator </td><td colspan=1 rowspan=1 > Beast </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1992 </td><td colspan=1 rowspan=1 > Aladdin </td><td colspan=1 rowspan=1 > Supervising Animator </td><td colspan=1 rowspan=1 > Aladdin </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1995 </td><td colspan=1 rowspan=1 > Pocahontas </td><td colspan=1 rowspan=1 > Story / Supervising Animator / Visual Development / Character Designer </td><td colspan=1 rowspan=1 > Pocahontas </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1999 </td><td colspan=1 rowspan=1 > Tarzan </td><td colspan=1 rowspan=1 > Story / Supervising Animator </td><td colspan=1 rowspan=1 > Tarzan </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 2002 </td><td colspan=1 rowspan=1 > Treasure Planet </td><td colspan=1 rowspan=1 > Supervising Animator </td><td colspan=1 rowspan=1 > Long John Silver </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 2003 </td><td colspan=1 rowspan=1 > Mickey's PhilharMagic (Short) </td><td colspan=1 rowspan=1 > Animator </td><td colspan=1 rowspan=1 > Ariel </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 2008 </td><td colspan=1 rowspan=1 > Bolt </td><td colspan=1 rowspan=1 > Special Thanks </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 2010 </td><td colspan=1 rowspan=1 > Tangled </td><td colspan=1 rowspan=1 > Executive Producer / Animation Supervisor / Character Designer </td><td colspan=1 rowspan=1 > Rapunzel </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 2011 </td><td colspan=1 rowspan=1 > Adam and Dog (Short) </td><td colspan=1 rowspan=1 > Film Consultant </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=2 > 2012 </td><td colspan=1 rowspan=1 > Paperman (Short) </td><td colspan=1 rowspan=1 > Character Designer </td><td colspan=1 rowspan=1 > Meg </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Wreck-It Ralph </td><td colspan=1 rowspan=1 > Additional Visual Development </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 2014 </td><td colspan=1 rowspan=1 > Duet (Short) </td><td colspan=1 rowspan=1 > Director / Animator </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 2016 </td><td colspan=1 rowspan=1 > Invasion! (Short) </td><td colspan=1 rowspan=1 > Special Thanks </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 2017 </td><td colspan=1 rowspan=1 > Dear Basketball (Short) </td><td colspan=1 rowspan=1 > Director / Animator </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Academy Award for best Short Animation </td></tr>
<tr> <td colspan=1 rowspan=1 > 2020 </td><td colspan=1 rowspan=1 > Over the Moon </td><td colspan=1 rowspan=1 > Director </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Feature directorial debut </td></tr>
</table>
Question:
Which animated characters were designed by Glen Keane in 1989 and 1990?
Answer:
Glen Keane designed and animated the character of Ariel in the film The Little Mermaid (1989) and Marahute in The Rescuers Down Under (1990).