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:
Río Chico Department, Santa Cruz
Table title:
Demography
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 >  </th><th colspan=1 rowspan=1 > 1947 </th><th colspan=1 rowspan=1 > 1960 </th><th colspan=1 rowspan=1 > 1970 </th><th colspan=1 rowspan=1 > 1980 </th><th colspan=1 rowspan=1 > 1991 </th><th class="highlighted"  colspan=1 rowspan=1 > 2001 </th></tr>
<tr> <td colspan=1 rowspan=1 > Population </td><td colspan=1 rowspan=1 > 2,588 </td><td colspan=1 rowspan=1 > 1,960 </td><td colspan=1 rowspan=1 > 2,256 </td><td colspan=1 rowspan=1 > 2,063 </td><td colspan=1 rowspan=1 > 2,654 </td><td class="highlighted"  colspan=1 rowspan=1 > 2,926 </td></tr>
<tr> <td colspan=1 rowspan=1 > Variation </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 24.26% </td><td colspan=1 rowspan=1 > +15.10% </td><td colspan=1 rowspan=1 > 8.55% </td><td colspan=1 rowspan=1 > +28.64% </td><td colspan=1 rowspan=1 > +10.24% </td></tr>
</table>
Question:
What was the population of Río Chico in 1991 and 2001.
Answer:
Río Chico Department had a population of 2,654 in 1991 and a population of 2,926 in 2001.