imo, that's not normal. i have a one year old car too, level hasn't changed over the span of one year. maybe if the loss is minimal, like 1 millimeter, then that's ok. i think there's a leak somewhere. check the radiator cap, the leak might be there. there should be some dried up white stuff around it, water/coolant that leaked out when the engine was hot. if you ever decide to refill it, use distilled water mixed with coolant and add to the reservoir, not the radiator. you may also use premixed coolant and simply add. be sure to get the right spec coolant.