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:
1981 Mississippi's 4th congressional district special election
Table title:
Results
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 class="highlighted"  colspan=1 rowspan=1 > Democratic </td><td class="highlighted"  colspan=1 rowspan=1 > Wayne Dowdy </td><td colspan=1 rowspan=1 > 55,656 </td><td colspan=1 rowspan=1 > 50.41% </td><td colspan=1 rowspan=1 > +21.01% </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > Republican </td><td class="highlighted"  colspan=1 rowspan=1 > Liles Williams </td><td colspan=1 rowspan=1 > 54,744 </td><td colspan=1 rowspan=1 > 49.59% </td><td colspan=1 rowspan=1 > +10.62% </td></tr>
<tr> <th colspan=3 rowspan=1 > Total votes </th><td colspan=1 rowspan=1 > 110,400 </td><td colspan=1 rowspan=1 > 100.0% </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=3 rowspan=1 > Majority </th><td class="highlighted"  colspan=1 rowspan=1 > 912 </td><td colspan=1 rowspan=1 > .08% </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=3 rowspan=1 > Turnout </th><td colspan=1 rowspan=1 > 110,400 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=2 rowspan=1 > Democratic gain from Republican </td><th colspan=1 rowspan=1 > Swing </th><td colspan=1 rowspan=1 > 21.01% </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
By how many votes did Democrat Wayne Dowdy defeat Republican Liles Williams in the 1981 Mississippi's 4th congressional ?
Answer:
Democrat Wayne Dowdy defeated Republican Liles Williams in the runoff by 912 votes.