Trying to eliminate old application sources

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We have over 500 application sources, I'm trying to pull application sources that haven't been used in the last 6 months or a year. Does anyone know how I would do that?

I have pulled all applications submitted over the last year, however that report does not include sources with zero applicants. I have also matched that report up to applications submitted our first year using Taleo and again since it does not include applications with zero applicants we don't know what sources have “one” application and what has “zero” applications.

Any help or direction would be appreciated!

Also, does anyone know how eliminating these sources or repurposing them would effect reporting?