 21.2% of the population had Chinese ancestry (up from 18.3% in 2001), 12.7% had generic Australian ancestry (11.7% in 2001), 12% had Malay ancestry (9.3% in 2001), 10% had English ancestry (8.9% in 2001), and 2.3% of the population was of Irish origin (the same share as in 2001).48.1% of the population has undetermined ancestry., most are people born in Christmas Island and many are of Chinese and Malay origin.