I would say system reporter is your best bet.
Choose a VV Space Usage report and then filter on the hosts or VV's you are interested in. The graph you will probably be most interested in will be VV Used Space - which will tell you if you are thin provisioning how the volume has grown over time.
I would also run a report PD Space report, as this will give you a good overview of the capacity trends on the system as a whole and will account for space taken up by RAID , system overhead etc.
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