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:
Copper in renewable energy
Table title:
Overview of copper usage in renewable energy generation
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 >  </th><th colspan=1 rowspan=1 > Installed power in 2011 </th><th colspan=1 rowspan=1 > Cumulative installed power to 2011 </th><th colspan=1 rowspan=1 > Copper use in 2011 </th><th colspan=1 rowspan=1 > Cumulative copper use to 2011 </th></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Gigawatts (GW) </td><td colspan=1 rowspan=1 > Gigawatts (GW) </td><td colspan=1 rowspan=1 > Kilotons (kt) </td><td colspan=1 rowspan=1 > Kilotons (kt) </td></tr>
<tr> <td colspan=1 rowspan=1 > Photovoltaics </td><td colspan=1 rowspan=1 > 30 </td><td colspan=1 rowspan=1 > 70 </td><td class="highlighted"  colspan=1 rowspan=1 > 150 </td><td colspan=1 rowspan=1 > 350 </td></tr>
<tr> <td colspan=1 rowspan=1 > Solar thermal electricity </td><td colspan=1 rowspan=1 > 0.46 </td><td colspan=1 rowspan=1 > 1.76 </td><td class="highlighted"  colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > 7 </td></tr>
<tr> <td colspan=1 rowspan=1 > Wind </td><td colspan=1 rowspan=1 > 40 </td><td colspan=1 rowspan=1 > 238 </td><td class="highlighted"  colspan=1 rowspan=1 > 120 </td><td colspan=1 rowspan=1 > 714 </td></tr>
<tr> <td colspan=1 rowspan=1 > Total for all three technologies </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > 272 </td><td colspan=1 rowspan=1 > 1071 </td></tr>
</table>
Question:
What year did the copper distribution used in renewable energy and electricity generation amount to 272 kilotons (kt)?
Answer:
The total amount of copper distribution used in renewable energy and electricity generation in 2011 was 272 kilotons (kt).