Query With Rows Based On Date Range?

Hi everyone, I am hoping to learn something new about access today. What I need is to be able to run a query that gives me rows of data based on paramenters that I specify. For example, I will query this all just on one table and I want to come up with an output that is in a nice format as follows:

Parameter..........................Member Count
01/01/04 thru 01/20/04...............298
02/01/04 thru 02/20/04...............287
03/01/04 thru 03/20/04...............301
04/01/04 thru 04/20/04...............254

And so on, usually for a calendar year.

Basically each member has an effective date, like member A might have 01/15/04 effective date and member B might have 01/02/04 effective date. I need to capture the count of members by month based on their effective date range. I would like to do it all in one query like above instead of just running a query for January, then February, then March, so on.

Is there a way to do this? Right now I am just running a query and getting one member count at a time and copying that number to an excel spreadsheet. it works okay, but is time consuming. I would rather semi-automate things for me. Any ideas?

Oh and I am new to access, by no means an expert, so be gentle with me.

Thanks,
Hanna