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:
Global Fashion Group
Table title:
Business figures
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Net Revenue (EURm) </th><th colspan=1 rowspan=1 > Revenue growth (%, FX neutral basis) </th><th colspan=1 rowspan=1 > Adjusted EBITDA margin </th><th colspan=1 rowspan=1 > Cash position (EURm) </th></tr>
<tr> <td colspan=1 rowspan=1 > 2014 </td><td colspan=1 rowspan=1 > 627.5 </td><td colspan=1 rowspan=1 > Undisclosed </td><td colspan=1 rowspan=1 > (38.0)% </td><td colspan=1 rowspan=1 > 223.8 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2015 </td><td colspan=1 rowspan=1 > 808.0 </td><td colspan=1 rowspan=1 > 48.2% </td><td colspan=1 rowspan=1 > (26.9)% </td><td colspan=1 rowspan=1 > 76.7 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2016 </td><td colspan=1 rowspan=1 > 1023.1 (excl. Jabong) </td><td colspan=1 rowspan=1 > 26.4% </td><td class="highlighted"  colspan=1 rowspan=1 > (12.5)% </td><td colspan=1 rowspan=1 > 255.0 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2017 </td><td colspan=1 rowspan=1 > 1095.0 (excl. Jabong & Namshi) </td><td colspan=1 rowspan=1 > 19.9% </td><td class="highlighted"  colspan=1 rowspan=1 > (8.9%) </td><td colspan=1 rowspan=1 > 257.3 </td></tr>
</table>
Question:
What was the percentage of decrease of GFG's adjusted EBITDA margin from 2016 to 2017?
Answer:
GFG's adjusted EBITDA margin decreased from 12.5% in 2016 to 8.9% in 2017.