Found this interesting map of astroids which pass through Earth's orbit. Pretty much shows the shooting gallery we run through. These are the top 1400 that are a little "too close for comfort".
(http://i.space.com/images/i/000/031/771/original/potential-hazardous-asteroids-crop.jpg)
Source - http://www.space.com/22369-nasa-asteroid-threat-map.html