 There is a small ethnic Turkish Protestant Christian community include about 4,000–5,000 adherents, most of them came from Muslim Turkish background.The percentage of Christians in Turkey fell from 17.5% (three million followers) in a population of 16 million to 2.5% percent in 1927.The drop was the result of events that had a significant impact on the country's demographic structure, such as the Armenian Genocide, the population exchange between Greece and Turkey and the emigration of Christians that began in the late 19th century and gained pace in the first quarter of the 20th century.