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:
Hydro-Québec
Table title:
Quebec market
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=2 >  </th><th colspan=2 rowspan=1 > Number of customers </th><th colspan=2 rowspan=1 > Sales in Quebec (GWh) </th><th colspan=2 rowspan=1 > Revenue (C$M) </th><th colspan=2 rowspan=1 > Average annual consumption (kWh) </th></tr>
<tr> <th colspan=1 rowspan=1 > 2011 </th><th colspan=1 rowspan=1 > 2010 </th><th colspan=1 rowspan=1 > 2011 </th><th colspan=1 rowspan=1 > 2010 </th><th colspan=1 rowspan=1 > 2011 </th><th colspan=1 rowspan=1 > 2010 </th><th colspan=1 rowspan=1 > 2011 </th><th colspan=1 rowspan=1 > 2010 </th></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > Residential and farm </th><td colspan=1 rowspan=1 > 3,746,397 </td><td colspan=1 rowspan=1 > 3,698,169 </td><td colspan=1 rowspan=1 > 62,748 </td><td colspan=1 rowspan=1 > 59,534 </td><td colspan=1 rowspan=1 > 4,536 </td><td colspan=1 rowspan=1 > 4,302 </td><td colspan=1 rowspan=1 > 16,857 </td><td colspan=1 rowspan=1 > 16,205 </td></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > General and institutional </th><td colspan=1 rowspan=1 > 291,212 </td><td colspan=1 rowspan=1 > 300,163 </td><td colspan=1 rowspan=1 > 33,569 </td><td colspan=1 rowspan=1 > 33,865 </td><td colspan=1 rowspan=1 > 2,599 </td><td colspan=1 rowspan=1 > 2,648 </td><td colspan=1 rowspan=1 > 113,529 </td><td colspan=1 rowspan=1 > 113,347 </td></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > Industrial </th><td colspan=1 rowspan=1 > 18,573 </td><td colspan=1 rowspan=1 > 9,589 </td><td colspan=1 rowspan=1 > 67,621 </td><td colspan=1 rowspan=1 > 68,439 </td><td colspan=1 rowspan=1 > 3,262 </td><td colspan=1 rowspan=1 > 3,185 </td><td colspan=1 rowspan=1 > 4,802,287 </td><td colspan=1 rowspan=1 > 7,049,027 </td></tr>
<tr> <th colspan=1 rowspan=1 > Others </th><td colspan=1 rowspan=1 > 4,013 </td><td colspan=1 rowspan=1 > 3,868 </td><td colspan=1 rowspan=1 > 6,028 </td><td colspan=1 rowspan=1 > 7,647 </td><td colspan=1 rowspan=1 > 323 </td><td colspan=1 rowspan=1 > 371 </td><td colspan=1 rowspan=1 > 1,529,755 </td><td colspan=1 rowspan=1 > 2,033,506 </td></tr>
<tr> <th colspan=1 rowspan=1 > Total </th><td class="highlighted"  colspan=1 rowspan=1 > 4,060,195 </td><td colspan=1 rowspan=1 > 4,011,789 </td><td colspan=1 rowspan=1 > 169,966 </td><td colspan=1 rowspan=1 > 169,495 </td><td colspan=1 rowspan=1 > 10,720 </td><td colspan=1 rowspan=1 > 10,506 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
Who did Hydro-Québec primarily serve in 2011?
Answer:
Hydro-Québec served 4,060,195 customers in 2011, of which 3,746,397 were in the residential and farm category.