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:
Darko Šarović
Table title:
Statistics
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > PB </th><th colspan=1 rowspan=1 > 60 m </th><th colspan=1 rowspan=1 > 100 m </th><th colspan=1 rowspan=1 > 200 m </th></tr>
<tr> <td colspan=1 rowspan=1 > 2008 </td><td colspan=1 rowspan=1 > 7.34 </td><td colspan=1 rowspan=1 > 11.51 </td><td colspan=1 rowspan=1 > 23.31 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2009 </td><td colspan=1 rowspan=1 > 7.04 </td><td colspan=1 rowspan=1 > 11.40 </td><td colspan=1 rowspan=1 > 23.09i </td></tr>
<tr> <td colspan=1 rowspan=1 > 2010 </td><td colspan=1 rowspan=1 > ‡ </td><td colspan=1 rowspan=1 > 10.83 </td><td colspan=1 rowspan=1 > 22.44 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2011 </td><td colspan=1 rowspan=1 > 6.96 </td><td colspan=1 rowspan=1 > 10.46 </td><td class="highlighted"  colspan=1 rowspan=1 > 21.94 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2012 </td><td colspan=1 rowspan=1 > 6.89 </td><td colspan=1 rowspan=1 > 10.49w </td><td class="highlighted"  colspan=1 rowspan=1 > 21.52 </td></tr>
</table>
Question:
When did Danko Sarivic lower his personal  best  and how much was it lowered?                  
Answer:
Darko Šarović lowered his personal best by 0.42s to 21.52 from 2011.