[xsl] format % issue

Hi

What is the workaround to just print the % number ?

Fatal Error! Required item type of first argument of format-number()
is numeric; supplied value has item type xs:string


        <xsl:template name="display-percent">
                <xsl:param name="value" />
                < xsl:value-of select="format-number($value,'0.00%')" />
        </xsl:template>


<xsl:if test="$testcase=1">
        <xsl:call-template name="display-percent">
                <xsl:with-param name="value" select="$successPercent" />
        </xsl:call-template>
</xsl:if>
<xsl:if test="$testcase=3">
        <xsl:call-template name="display-percent">
                <xsl:with-param name="value" select="$successPercent" />
        </xsl:call-template>
</xsl:if >

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