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:
Bilsby
Table title:
Population
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=12 rowspan=1 > Population of Bilsby Civil Parish </th><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > 1801 </th><th colspan=1 rowspan=1 > 1811 </th><th colspan=1 rowspan=1 > 1821 </th><th colspan=1 rowspan=1 > 1831 </th><th colspan=1 rowspan=1 > 1841 </th><th colspan=1 rowspan=1 > 1851 </th><th colspan=1 rowspan=1 > 1881 </th><th colspan=1 rowspan=1 > 1891 </th><th colspan=1 rowspan=1 > 1901 </th><th colspan=1 rowspan=1 > 1911 </th><th colspan=1 rowspan=1 > 1921 </th><th colspan=1 rowspan=1 > 1931 </th><th colspan=1 rowspan=1 > 1951 </th><th colspan=1 rowspan=1 > 1961 </th><th class="highlighted"  colspan=1 rowspan=1 > 2001 </th><th class="highlighted"  colspan=1 rowspan=1 > 2011 </th></tr>
<tr> <th colspan=1 rowspan=1 > Population </th><td colspan=1 rowspan=1 > 337 </td><td colspan=1 rowspan=1 > 373 </td><td colspan=1 rowspan=1 > 416 </td><td colspan=1 rowspan=1 > 453 </td><td colspan=1 rowspan=1 > 584 </td><td colspan=1 rowspan=1 > 611 </td><td colspan=1 rowspan=1 > 510 </td><td colspan=1 rowspan=1 > 450 </td><td colspan=1 rowspan=1 > 387 </td><td colspan=1 rowspan=1 > 377 </td><td colspan=1 rowspan=1 > 313 </td><td colspan=1 rowspan=1 > 318 </td><td colspan=1 rowspan=1 > 293 </td><td colspan=1 rowspan=1 > 251 </td><td class="highlighted"  colspan=1 rowspan=1 > 415 </td><td class="highlighted"  colspan=1 rowspan=1 > 487 </td></tr>
</table>
Question:
What are the two most recent years data was collected for the Bilsby Civil Parish, and what was the parish's population during those two years?
Answer:
In 2001, the parish had a population of 415, which increased to 487 in 2011.