Within the last 3 years it seems the gap is getting worse. When the garage is closed the center touches and the corner section of the driveway seems to be sinking, this is where the garage door sits on and not the floor slab. I put a new seal on the bottom of the garage door and that helped a little but I'm not sure what to do with it.
sorry not a picture taking kinda guy. :D
From inside the garage:
you can see from the original paint how much it has dropped in the last few years.