BI Publisher Ring Chart Thickness - oracle

Question

I am relatively new to BI Publisher and I have to date only worked with line and bar charts.
I am working on a report that uses Ring Charts, and the default thickness of the chart is too much. I want it to look like a hoola hoop and not a doughnut, as below. But I dont know what node to change in the XML, can someone advise?
Chart Currently looks like this:
I would like it to look like this:
Any help is greatly appreciated.
Thanks
Chart Code
<Graph seriesEffect="SE_NONE" graphType="RING">
<LegendArea visible="false" />
<SeriesItems>
<Series id="0" color="#447A27" />
<Series id="1" color="#96b27f" />
<Series id="2" color="#c4c5c7" />
<Series id="3" color="#EA4848" />
<Series id="4" color="#C41C24" />
</SeriesItems>
<SliceLabel visible="false">
<ViewFormat decimalDigit="0" decimalDigitUsed="true" />
</SliceLabel>
<LocalGridData colCount="1" rowCount="{count(.//DATASET[condition='Test'])}">
<RowLabels>
<xsl:for-each select=".//DATASET[condition='Test']" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<Label>
<xsl:value-of select="QUALITY_LEVEL" />
</Label>
</xsl:for-each>
</RowLabels>
<DataValues>
<xsl:for-each select=".//DATASET[condition='Test']" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<RowData>
<Cell>
<xsl:value-of select="COUNT" />
</Cell>
</RowData>
</xsl:for-each>
</DataValues>
</LocalGridData>
<RingTotalLabel>
<GraphFont size="50" fontColor="#c4c5c7" />
</RingTotalLabel>
</Graph>