After doing some totaling, here is what I'm looking at for overall sales:
Print: 20.4% of sales
Ebook: 71.7% of sales
Audiobook: 7.9% of sales
Comparing those to statistics listed in April 2014 based on Sales through the 1st Quarter of 2014:
Print: 21.4% of sales
Ebook: 73.5% of sales
Audiobook: 5.1% of sales
Trends I see:
The uptick in audio is due to the having the books available in audio. In general, my publisher releases my novels in ebook, followed shortly thereafter in print. Audiobooks become available a little further down the road (the delay due to finding and screening narrators, and then the production process which follows).
One upcoming addition to the sales observation will be the foreign release version of Flank Hawk (in Spanish). It will be released in ebook, and depending on how that goes, print and possibly audio might follow.
Gryphonwood Press) is planning some marketing efforts focused on Relic Tech and Flank Hawk, which may alter future sales and trends.