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:
Gleniffer High School
Table title:
National Comparisons
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Of those starting S4 in 2009>> </th><th colspan=1 rowspan=1 > % with at least 3 Higher C's, 2011 </th><th colspan=1 rowspan=1 > % with at least 5 Higher C's, 2011 </th><th colspan=1 rowspan=1 > % entitled to free meals, 2011 </th><th colspan=1 rowspan=1 > Type of school </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Scotland as a whole </td><td colspan=1 rowspan=1 > 26% </td><td colspan=1 rowspan=1 > 12% </td><td class="highlighted"  colspan=1 rowspan=1 > 15.2% </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Gleniffer High School </td><td colspan=1 rowspan=1 > 31% </td><td colspan=1 rowspan=1 > 10% </td><td class="highlighted"  colspan=1 rowspan=1 > 15.5% </td><td colspan=1 rowspan=1 > State school </td></tr>
<tr> <td colspan=1 rowspan=1 > Govan High School </td><td colspan=1 rowspan=1 > 3% </td><td colspan=1 rowspan=1 > 0% </td><td colspan=1 rowspan=1 > 62.4% </td><td colspan=1 rowspan=1 > State school </td></tr>
<tr> <td colspan=1 rowspan=1 > Woodfarm High School </td><td colspan=1 rowspan=1 > 49% </td><td colspan=1 rowspan=1 > 28% </td><td colspan=1 rowspan=1 > 12.1% </td><td colspan=1 rowspan=1 > State school </td></tr>
<tr> <td colspan=1 rowspan=1 > Glasgow Academy </td><td colspan=1 rowspan=1 > 87% </td><td colspan=1 rowspan=1 > 61% </td><td colspan=1 rowspan=1 > 0% </td><td colspan=1 rowspan=1 > Private day school, fees £10,800 per academic year </td></tr>
<tr> <td colspan=1 rowspan=1 > Dollar Academy </td><td colspan=1 rowspan=1 > 99% </td><td colspan=1 rowspan=1 > 84% </td><td colspan=1 rowspan=1 > 0% </td><td colspan=1 rowspan=1 > Private boarding school, fees £22,941 per annum </td></tr>
</table>
Question:
How did  Gleniffer High School perform as compared to Scotland average?
Answer:
15.5% was slightly higher than the Scotland average of 15.2%.