I wonder what the turn-over rates are for most startups. I was recently let go from a start-up that over the last two years has seen 200% turn-over (3-people te

I wonder what the turn-over rates are for most startups. I was recently let go from a start-up that over the last two years has seen 200% turn-over (3-people team, 6 new hires didn't make the cut). I've also spoken to a friend just left a start-up that he figures has had 90% turn-over since he arrived a year ago, and the start-up is just two years old. So, if the past year is any indication, about 180% turn-over on a team of about 18. Is this really that common? Or am I just hearing of the horror stories?