During the 2000s, Sonora has increased its tourism infrastructure. In the last half of the 2000s, Sonora has increased its network of highways from  to , accounting for 6.7% of all highways in Mexico. It ranks second in four-lane highways, surpassed only by Chihuahua. From 2003 to 2009 the number of hotels in the state has increased from 321 to 410 and the number of rooms from 13,226 to 15,806, over 20%. Most of these hotels and rooms are in Hermosillo (57 hotels/3232 rooms) followed by Puerto Peñasco (40/3158), Ciudad Obregón (41/1671), Guaymas/San Carlos (28/1590), Nogales (24/1185), Navojoa (15/637) and Magdalena de Kino (10/284). The cities of Hermosillo, Ciudad Obregón, Guaymas, Nogales, San Luis Río Colorado, Puerto Peñasco, Bahía Kino and Álamos all have 5-star hotels. There are 2,577 restaurants in the state with 1288 in Hermosillo.. How many more hotels does  the city with the most have, compared with the city with the least number of hotels?