REQ Openings Over Time Line Graph

Summary

Looking to create graph to display the number of total req openings over time

Content

Hi, we are trying to automate a report via Taleo that would show via a line graph the total # of req openings (openings less hired) at points of time. I'm struggling with how to do this. We would want to show a line graph that shows week/week or month/month how the total # of openings the recruiter are managing has changed and have it keep adding on. Can anyone help point me in the right direction on how/if this can be done via OBIEE?