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:
Phil Anderson (politician)
Table title:
Electoral history
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=2 rowspan=1 > Party </th><th colspan=1 rowspan=1 > Candidate </th><th colspan=1 rowspan=1 > Votes </th><th colspan=1 rowspan=1 > % </th><th colspan=1 rowspan=1 > ± </th></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Democratic </td><td class="highlighted"  colspan=1 rowspan=1 > Robb Kahl </td><td colspan=1 rowspan=1 > 20,332 </td><td colspan=1 rowspan=1 > 81.6 </td><td colspan=1 rowspan=1 > 10.7 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > Independent </td><td class="highlighted"  colspan=1 rowspan=1 > Phillip Anderson </td><td colspan=1 rowspan=1 > 4,596 </td><td class="highlighted"  colspan=1 rowspan=1 > 18.4 </td><td colspan=1 rowspan=1 > N/A </td></tr>
<tr> <th colspan=3 rowspan=1 > Turnout </th><td colspan=1 rowspan=1 > 24,928 </td><td colspan=1 rowspan=1 > 100.0 </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
What percentage of the vote did Anderson gain against Kahl in the election?
Answer:
Phil Anderson as an Independent against Robb Kahl gathered 18.4 percent of the vote.