Working with Insights developing reporting for a global organization.  

I am looking for a way to measure the volume of open quotes or Quote "Backlog" over time.  In other words, What was our volume of open quotes in January vs July vs October.  This would mean that July would show all quotes that were still open in July as open backlog even though the deal has closed in August/September and is no longer an open quote in October.


Does anyone else have a need for this or have a solution?