Hourly Usage for Computing Resources

I am trying to get hourly usage of computing resources from xml report. I am generating daily reports which shows me details of memory usage like:

</Attributes>

<Parents>

<Parentid="16232">

  <Name>028072-AlphaGroup-RigginTest</Name>

<Type>112</Type>

<CostModelid="625">

<Name>LT_MATRIX_COST_MODEL</Name>

<Messages/>

<Resources>

<Resourceid="5">

<Name>Memory</Name>

<Details>

<Detail>

<StartTime>1362549600000</StartTime>

<EndTime>1362553200000</EndTime>

<AttributionPercent>100.00</AttributionPercent>

<Usage>2.00000</Usage>

</Detail>

<Detail>

<StartTime>1362553200000</StartTime>

<EndTime>1362560400000</EndTime>

<AttributionPercent>100.00</AttributionPercent>

<Usage>2.00000</Usage>

</Detail>

<Detail>

<StartTime>1362560400000</StartTime>

<EndTime>1362567600000</EndTime>

<AttributionPercent>100.00</AttributionPercent>

<Usage>2.00000</Usage>

</Detail>

But for memory and Harddrive it shows just one entry:

<Resourceid="10">

<Name>vCPU</Name>

<Details>

<Detail>

<StartTime>1362549600000</StartTime>

<EndTime>1362635999998</EndTime>

<AttributionPercent>100.00</AttributionPercent>

<Usage>1.00000</Usage>

</Detail>

How can I get usage details for Memory and vCPU too hourly?

Thanks,

Savita