Please check out this sample code given below:
<chart showValues='0' connectNullData='1'> <set label='Jan' value='420' /> <set label='Feb' value='295' /> <set label='Mar' value='523' /> <set label='Apr' value='473' /> <set label='May' /> <set label='Jun' /> <set label='Jul' value='354' /> <set label='Aug' value='457' /> <set label='Sep' value='127' /> <set label='Oct' value='354' /> <set label='Nov' value='485' /> <set label='Dec' value='486' /> </chart>
Hope it may help you.