You can have a look at the initial mass function (IMF), which is an empirical function (which is to say, based on observation rather than having a fundamental theoretical foundation) that describes the distribution of initial stellar masses. read more
I think 80% of the stars are red dwarfs in the Milky Way, so the yellow dwarfs must be below 20%. I wonder how many of that remaining 20% are non-yellow dwarfs (blue giants, hyper giants, etc) This LA Times article says: Many Earth-like planets orbit sun-like stars.. read more