In my experience, you can go a long time without hitting a deer and once you hit one, it seems like you become a deer magnet after that. I've had 3 run into the side of my trucks and have ran over a few with no damage.
When the kids were small the wife had a mini-van, I took it to work one day and had a big doe come out of the ditch and jump over the van. Just her hind hooves clacked the top side of the roof on her way down. After that the wife hit several deer with that damn van. lol