Passage: Genetic research suggests that the earliest settlers migrated from Iberia following the most recent ice age. After the Mesolithic, Neolithic and Bronze Age, migrants introduced a Celtic language and culture. Migrants from the two latter eras still represent the genetic heritage of most Irish people. Gaelic tradition expanded and became the dominant form over time. Irish people are a combination of Gaelic, Norse, Anglo-Norman, French, and British ancestry. The population of Ireland stood at 4,588,252 in 2011, an increase of 8.2% since 2006. As of  2011, Ireland had the highest birth rate in the European Union . In 2014, 36.3% of births were to unmarried women. Annual population growth rates exceeded 2% during the 2002-2006 intercensal period, which was attributed to high rates of natural increase and immigration. This rate declined somewhat during the subsequent 2006-2011 intercensal period, with an average annual percentage change of 1.6%. At the time of the 2011 census, the number of non-Irish nationals was recorded at 544,357, comprising 12% of the total population. This is nearly 2.5 times the number of non-Irish nationals recorded in the 2002 census , when the question of nationality was asked for the first time. The five largest non-national cohorts were Polish , UK , Lithuanian , Latvian  and Nigerian  respectively.
After how many ages did migrants introduce Celtic language and culture? How many different groups combined to form the Irish? How many of the 4,588,252 people counted in the 2011 census were Irish? How many of the population were not Non-Irish nationals? How many yeaers did these events span for? How many years did it take to increase the population of Ireland by 8.2%? Irish people are a combination of how many different ancestries? Migrants from which two eras still represent the genetic heritage of most Irish people? Was the average annual population growth rate in Ireland higher in the years 2002-2006 or 2006-2011? Was the number of non-Irish nationals living in Ireland higher in 2002 or 2011? Was the population of Ireland higher in 2011 or 2006? Were more children born to married or unmarried women in Ireland in 2014? Which one of the three eras does not represent the genetic heritage of most Irish people? Who accounted for most of the non-national population? Who accounted for the least of the non-national population observed?