cfchart - how do I stop percent value from rounding

I am trying to present a simple chart with labelformat="percent" (see below).

The problem is that the values being presented are decimal values between 1 and 2. Although it appears to put the data markers in the correct placed, it is rounding the label to the nearest integer. so 1.86% becomes 2%, 1.44% becomes 1% etc.

Does anyone have any suggestions on how I can stop this rounding?

Thanks in advance.

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<cfchart style="blue" show3D="no" chartwidth="800" chartheight="500" showlegend="yes" format="png" labelformat="percent" >
<cfchartseries type="line" seriesColor="green" seriesLabel="Victoria">
<cfchartdata item="July 2007" value=".0186">
<cfchartdata item="August 2007" value=".0170">
<cfchartdata item="September 2007" value=".0160">
<cfchartdata item="October 2007" value=".0144">
</cfchartseries>
</cfchart>