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:
Darlington (UK Parliament constituency)
Table title:
Elections in the 2010s
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 class="highlighted"  colspan=1 rowspan=1 > Jenny Chapman </td><td colspan=1 rowspan=1 > 17,637 </td><td colspan=1 rowspan=1 > 42.9 </td><td colspan=1 rowspan=1 > +3.5 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > Conservative </td><td colspan=1 rowspan=1 > Peter Cuthbertson </td><td colspan=1 rowspan=1 > 14,479 </td><td colspan=1 rowspan=1 > 35.2 </td><td colspan=1 rowspan=1 > +3.7 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > UKIP </td><td colspan=1 rowspan=1 > David Hodgson </td><td colspan=1 rowspan=1 > 5,392 </td><td colspan=1 rowspan=1 > 13.1 </td><td colspan=1 rowspan=1 > +10.3 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Liberal Democrat </td><td colspan=1 rowspan=1 > Anne-Marie Curry </td><td colspan=1 rowspan=1 > 1,966 </td><td colspan=1 rowspan=1 > 4.8 </td><td colspan=1 rowspan=1 > −18.6 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Green </td><td colspan=1 rowspan=1 > Michael Cherrington </td><td colspan=1 rowspan=1 > 1,444 </td><td colspan=1 rowspan=1 > 3.5 </td><td colspan=1 rowspan=1 > N/A </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > TUSC </td><td colspan=1 rowspan=1 > Alan Docherty </td><td colspan=1 rowspan=1 > 223 </td><td colspan=1 rowspan=1 > 0.5 </td><td colspan=1 rowspan=1 > N/A </td></tr>
<tr> <th colspan=3 rowspan=1 > Majority </th><td class="highlighted"  colspan=1 rowspan=1 > 3,158 </td><td colspan=1 rowspan=1 > 7.7 </td><td colspan=1 rowspan=1 > −0.2 </td></tr>
<tr> <th colspan=3 rowspan=1 > Turnout </th><td colspan=1 rowspan=1 > 41,141 </td><td colspan=1 rowspan=1 > 62.5 </td><td colspan=1 rowspan=1 > +0.6 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=2 rowspan=1 > Labour hold </td><th colspan=1 rowspan=1 > Swing </th><td colspan=1 rowspan=1 > −0.1 </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
In what year did Jenny Chapman won over the conservatives and the elections majority was 3,158.?
Answer:
In 2015, Jenny Chapman won over the Conservatives and the elections majority was 3,158.