How big % is luck? (Beat my wife 38/50)

My wife (K38 German, just slightly above average intelligence) and I (M40, Danish) have played 50 games and I won the 38 of them. It's coming to an extend where I would happily play for large summs of money, it we didn't share the same wallet.

My question is, how much is luck and how much is pure skill?

I'm hoping for a good decent dialogue about this, as I'm really i doubt here.