I found a fun free (though, do donate) app for analysing your photo statistics.  You can get it at

I ran it against the 6,500 photos I took in 2014.  (Yes, I was surprised I had that many files for last year too).

Looking at the focal length there's a massive spike for 40mm.  I'd imagine I use my 50mm prime more than anything else which leads me to suspect it gets recorded as slightly less and then reported at 40mm.