Historic View showing level of Open Requests

Historic View showing level of Open Requests

I am after a report that shows the level of open requests over the last six weeks, Is there a pre-built report to do this or can anyone give me an idea on how to produced it?
 
I can produce a report showing how many have been created but non that gives me the level of requests open on a date.
 
Thanks in Advance
 
Shaun


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