<?xml version="1.0" encoding="UTF-8"?>
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<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
<roleRef xlink:type="simple" xlink:href="cik0000887340-20120113.xsd#RiskreturnDetailData" roleURI="http://www.mfs.com/role/RiskreturnDetailData"/>
<calculationLink xlink:type="extended" xlink:role="http://www.mfs.com/role/RiskreturnDetailData"/>
</linkbase>
