There are three levels of NUTS. Some with two levels of local administrative units (LAUs) below. These were called NUTS levels 4 and 5 until July 2003, but were changed due to official regulations although they are sometimes still described as such. Note that not all countries have every level of division, depending on their size. One of the most extreme cases is Luxembourg, which has only LAUs; the three NUTS divisions each correspond to the entire country itself.