Record Firearm Background Checks

First class and fancy free
She's high society 
She's got the best of everything
--Tau Bachman

Interesting data from the FBI National Instant Criminal Background Check System (NCIS). Top 10 days and weeks for firearm background checks (program started in late 1998) have all occurred in the last two months. So far in 2013, every week has placed in the top 10 all time.

I would like to plot monthly data since NCIS inception, but thus far have not been able to find such data.