Number of Contacts in a Source

Hi All,

I've been wanting to use the total number of contacts in a Source in Analytics, but I'm not so sure this is something I can actually pull in. Either I'm missing something, or it can't be done without a little bit of 'magic', or it just isn't possible. I would like to set up long-term tracking of an Appeal and I know I could use Lists, but I would much rather 'set it and forget it'.  Pulling in the Successful number of contacts is no problem, just getting that starting number of ALL of the contacts.

Could anyone give me a nudge in the right direction?

Many thanks!

Jenny O'Neill-Englund