Yes, it's not documented very well yet.
You can use the advanced search(it's not in basic yet) to check the following:
request-channel-type = portal
You can then break it down even further too. At that point, you can probably kick it out to excel to check distinct values. Check the following ticket: JSD-1583
Unfortunately, it's difficult to graph on these since they're not available in the basic search or the custom fields when generating a graph. I'm sure this will come along in the near future.
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