Article 66 of the Turkish Constitution defines a "Turk" as "anyone who is bound to the Turkish state through the bond of citizenship"; therefore, the legal use of the term "Turkish" as a citizen of Turkey is different from the ethnic definition. However approximately 70 to 80 percent of the country's citizens are ethnic Turks. It is estimated that there are at least 47 ethnic groups represented in Turkey. Reliable data on the ethnic mix of the population is not available, because Turkish census figures do not include statistics on ethnicity.