Here is a tool i made up in excel which allows you to monitor the growth and balance of specs in your guild. Simply copy the contents of your guild tab into the sheet, specifying the date. It is best to only do this about once a week, otherwise things like mass spawns may be missed.
You can then set each players spec and see a breakdown of the specs based on econ and fleet sizes. The players can then be ranked according to different growth parameters. I typically used this to create a Top 10 of the month.
This comes with data from an old guild i was in to demonstrate what you can do.
This requires excel 2007 or newer and can be downloaded from the link below:
ele's tools 