 British schools are common and some have long histories that derive from English migrants in the 19th century.According to the World Federation of the Deaf 2008 survey report for South America, Chile's official number of deaf citizens is 66,500.The number who master Chilean Sign Language is uncertain, but if it follows the general norm of one in four deaf persons having learnt sign language, the number of sign language users in Chile should be around 16,000.