Here's the 2015 HoD numbers
Republicans - 69%
Democrats - 30%
I find this a little hard to believe, but who knows. I couldn't find the numbers for 2013 though.
I mean I suppose it is possible because as Gass3268 was saying, Democrats have left so many seats uncontested for multiple cycles now. That would mean uncontested GOP seats rack up tons of votes all across the state. Still, though, that number is pretty absurd. I doubt it would be anything close to that if Democrats contested almost every seat like they are this year.
Now I'm even more interested in seeing how the battle for the HoD plays out