Dear Christian,
I use XSL but it did for only two column & give me result as below:
<?xml version="1.0" encoding="UTF-8"?><Rowsets DateCreated="2015-09-22T16:24:47" EndDate="2014-11-26T12:17:44" StartDate="2014-11-26T12:17:44" Version="14.0 SP5 Patch 15 (Nov 20, 2014)">
<Rowset>
<Columns/>
<Row>
<_2013-01-01T00_00_00>395.52</_2013-01-01T00_00_00>
<_2013-01-01T00_00_00>88.14</_2013-01-01T00_00_00>
<_2013-01-02T00_00_00>483.42</_2013-01-02T00_00_00>
<_2013-01-03T00_00_00>369.36</_2013-01-03T00_00_00>
Thanks
Muhammad Ashfaq