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:
1943 Christchurch East by-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 colspan=1 rowspan=1 > Labour </td><td colspan=1 rowspan=1 > Mabel Howard </td><td colspan=1 rowspan=1 > 4,559 </td><td colspan=1 rowspan=1 > 47.27 </td><td colspan=1 rowspan=1 > 28.47 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Democratic Labour </td><td colspan=1 rowspan=1 > Horace Herring </td><td colspan=1 rowspan=1 > 2,578 </td><td colspan=1 rowspan=1 > 26.73 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > National </td><td colspan=1 rowspan=1 > Melville Lyons </td><td colspan=1 rowspan=1 > 2,371 </td><td colspan=1 rowspan=1 > 24.59 </td><td colspan=1 rowspan=1 > +0.33 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Independent </td><td colspan=1 rowspan=1 > Lincoln Efford </td><td colspan=1 rowspan=1 > 114 </td><td colspan=1 rowspan=1 > 1.18 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Independent </td><td colspan=1 rowspan=1 > Owen McKee </td><td colspan=1 rowspan=1 > 22 </td><td colspan=1 rowspan=1 > 0.23 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=3 rowspan=1 > Majority </th><td colspan=1 rowspan=1 > 1,981 </td><td colspan=1 rowspan=1 > 20.54 </td><td colspan=1 rowspan=1 > 30.95 </td></tr>
<tr> <th colspan=3 rowspan=1 > Registered electors </th><td class="highlighted"  colspan=1 rowspan=1 > 14,835 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=3 rowspan=1 > Turnout </th><td class="highlighted"  colspan=1 rowspan=1 > 9,644 </td><td colspan=1 rowspan=1 > 65.01 </td><td colspan=1 rowspan=1 > 26.42 </td></tr>
</table>
Question:
How many people among all on the electoral roll vote for the 1943 by-election?
Answer:
There were 14,835 people on the electoral roll, of which 9,644 voted in the 1943 by-election.