Well, your LE is one of the LE's that has a numbered sequence. 3,997 were made and you should know which number yours is from a plaque somewhere on the car.
As far as how many were automatics, I bet you could call up Mazda NA and they could figure out how many BRG autos were manufactured.
If it is low mileage, in excellent condition, up-to-date maintenance, and you have all the LE stuff (docs, key fobs, or whatever else came with it) it's probably a pretty desirable car.