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:
List of mayors of Rimini
Table title:
Popular election (since 1995)
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 >  </th><th colspan=1 rowspan=1 > Mayor </th><th colspan=1 rowspan=1 > Term start </th><th colspan=1 rowspan=1 > Term end </th><th colspan=1 rowspan=1 > Party </th></tr>
<tr> <th colspan=1 rowspan=1 > 8 </th><td colspan=1 rowspan=1 > Giuseppe Chicchi </td><td colspan=1 rowspan=1 > 9 May 1995 </td><td colspan=1 rowspan=1 > 29 June 1999 </td><td colspan=1 rowspan=1 > Democratic Party of the Left Democrats of the Left </td></tr>
<tr> <th colspan=1 rowspan=3 > 9 </th><td colspan=1 rowspan=3 > Alberto Ravaioli </td><td colspan=1 rowspan=1 > 29 June 1999 </td><td colspan=1 rowspan=1 > 1 June 2001 </td><td colspan=1 rowspan=3 > Democrats of the Left Democratic Party </td></tr>
<tr> <td colspan=1 rowspan=1 > 1 June 2001 </td><td colspan=1 rowspan=1 > 11 June 2006 </td></tr>
<tr> <td colspan=1 rowspan=1 > 11 June 2006 </td><td colspan=1 rowspan=1 > 31 May 2011 </td></tr>
<tr> <th colspan=1 rowspan=2 > 10 </th><td class="highlighted"  colspan=1 rowspan=2 > Andrea Gnassi </td><td class="highlighted"  colspan=1 rowspan=1 > 31 May 2011 </td><td colspan=1 rowspan=1 > 8 June 2016 </td><td class="highlighted"  colspan=1 rowspan=2 > Democratic Party </td></tr>
<tr> <td colspan=1 rowspan=1 > 8 June 2016 </td><td class="highlighted"  colspan=1 rowspan=1 > Incumbent </td></tr>
</table>
Question:
Who is the current mayor of Rimini and when did they take office?
Answer:
The current Mayor is Andrea Gnassi who took office on 31 May 2011.