As of the latest 2007 population census conducted by the Ethiopian national statistics authorities, Addis Ababa has a total population of 2,739,551 urban and rural inhabitants. For the capital city 662,728 households were counted living in 628,984 housing units, which results in an average of 5.3 persons to a household. Although all Ethiopian ethnic groups are represented in Addis Ababa because it is the capital of the country, the largest groups include the Amhara (47.0%), Oromo (19.5%), Gurage (16.3%), Tigrayan (6.18%), Silt'e (2.94%), and Gamo (1.68%). Languages spoken as mother tongues include Amharic (71.0%), Afaan Oromo (10.7%), Gurage (8.37%), Tigrinya (3.60%), Silt'e (1.82%) and Gamo (1.03%). The religion with the most believers in Addis Ababa is Ethiopian Orthodox with 74.7% of the population, while 16.2% are Muslim, 7.77% Protestant, and 0.48% Catholic. In the previous census, conducted in 1994, the city's population was reported to be 2,112,737, of whom 1,023,452 were men and 1,089,285 were women. At that time not all of the population were urban inhabitants; only 2,084,588 or 98.7% were. For the entire administrative council there were 404,783 households in 376,568 housing units with an average of 5.2 persons per household. The major ethnic groups included the Amhara (48.3%), Oromo (30.2%), Gurage (13.5%; 2.3% Sebat Bet, and 0.8% Sodo), Tigrayan 7.64%, Silt'e 3.98%, and foreigners from Eritrea 1.33%. Languages spoken included Amharic (51.6%), Afaan Oromo (32.0%), Gurage (6.54%), Tigrinya (5.41%), and Silt'e 2.29%. In 1994 the predominant religion was also Ethiopian Orthodox with 82.0% of the population, while 12.7% were Muslim, 3.87% Protestant, and 0.78% Catholic. According to the 2007 national census, 98.64% of the housing units of Addis Ababa had access to safe drinking water, while 14.9% had flush toilets, 70.7% pit toilets (both ventilated and unventilated), and 14.3% had no toilet facilities.