How to derive per-row counts based on a combobox?

I am using Microsoft Access 2007. I have a series of comboboxes and would like to run a report on the content of those comboboxes. I would like to have two columns, the left column being the field entry, the right column being the number of times that entry was chosen in the database. It seems to me that this shouldn’t be that difficult, but I am completely stuck. Any ideas?