I was looking at Visitors Firearm Permits and noticed this document.
I don't know if it has been done before but there are some interesting figures showing the rise in firearms applications since 2002. Also the continuing rise in visitors permits.
The graphs show the bite that the recession had.
It does look into how more people now own more firearms per ticket.
What I found really interesting though was the historical data showing that firearms usage has only just exceeded 1994 levels, wouldn't have thought that.