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:
Ryan Heffington
Table title:
Music Videos
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 > Artist </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <td colspan=1 rowspan=1 > 2012 </td><td colspan=1 rowspan=1 > "Fjögur píanó" </td><td colspan=1 rowspan=1 > Sigur Rós </td><td class="highlighted"  colspan=1 rowspan=22 > Choreographer </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=6 > 2014 </td><td colspan=1 rowspan=1 > "I Try to Talk to You" </td><td colspan=1 rowspan=1 > Hercules and Love Affair </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > "Chandelier" </td><td class="highlighted"  colspan=1 rowspan=1 > Sia </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > "We Exist" </td><td class="highlighted"  colspan=1 rowspan=1 > Arcade Fire </td></tr>
<tr> <td colspan=1 rowspan=1 > "Gold" </td><td colspan=1 rowspan=1 > Chet Faker </td></tr>
<tr> <td colspan=1 rowspan=1 > "Video Girl" </td><td colspan=1 rowspan=1 > FKA Twigs </td></tr>
<tr> <td colspan=1 rowspan=1 > "Gunshot" </td><td colspan=1 rowspan=1 > Lykke Li </td></tr>
<tr> <td colspan=1 rowspan=8 > 2015 </td><td colspan=1 rowspan=1 > "Elastic Heart" </td><td colspan=1 rowspan=2 > Sia </td></tr>
<tr> <td colspan=1 rowspan=1 > "Big Girls Cry" </td></tr>
<tr> <td colspan=1 rowspan=1 > "What Kind of Man" </td><td colspan=1 rowspan=4 > Florence and the Machine </td></tr>
<tr> <td colspan=1 rowspan=1 > "Ship to Wreck </td></tr>
<tr> <td colspan=1 rowspan=1 > "St Jude" </td></tr>
<tr> <td colspan=1 rowspan=1 > "Queen of Peace"/"Long & Lost" </td></tr>
<tr> <td colspan=1 rowspan=1 > "Anna" </td><td colspan=1 rowspan=1 > Will Butler </td></tr>
<tr> <td colspan=1 rowspan=1 > "King" </td><td colspan=1 rowspan=2 > Years & Years </td></tr>
<tr> <td colspan=1 rowspan=3 > 2016 </td><td colspan=1 rowspan=1 > "Worship" </td></tr>
<tr> <td colspan=1 rowspan=1 > "Cheap Thrills" </td><td colspan=1 rowspan=3 > Sia </td></tr>
<tr> <td colspan=1 rowspan=1 > "The Greatest" </td></tr>
<tr> <td colspan=1 rowspan=2 > 2017 </td><td colspan=1 rowspan=1 > "Rainbow" </td></tr>
<tr> <td colspan=1 rowspan=1 > "Destroyer" </td><td colspan=1 rowspan=1 > "TR/ST" </td></tr>
<tr> <td colspan=1 rowspan=2 > 2018 </td><td colspan=1 rowspan=1 > "Thunderclouds" </td><td colspan=1 rowspan=1 > LSD - Labrinth, Diplo, Sia </td></tr>
<tr> <td colspan=1 rowspan=1 > "Colors" </td><td colspan=1 rowspan=1 > Beck </td></tr>
</table>
Question:
Who was the choreographer for Sia's 2014 video?
Answer:
Heffington choreographed the music videos for Sia's "Chandelier" in 2014 and Arcade Fire's "We Exist".