I have caller ID on my phones and my tv if tv is on. If I don't recognize the number or it says Private Caller, I let it go to the answering machine. After they hang up, and they never do leave a message, I Google the number to find out exactly what charity or group has called. We just came back from a short vacation and now I've got hotel chains calling in addition to all the others.
Never did count how many calls....I think I'd be afraid to...