evidence: - There are no figures available for Northern Ireland prior to 1911. Figures prior to 1911 include Eire (Northern Ireland and The Irish Free State). [...] In the 1951 Census of England and Wales, there were 492,000 Irish-born residents, accounting for more than a quarter (26%) of all foreign-born residents. Migration of Irish-born to Great Britain stretches back to the famine of the 1840s in Ireland and was associated with rapid industrialisation in Great Britain throughout the 19th century. [...] During the 1950s, increasing numbers of Irish and Caribbean-born migrants arrived in the UK. Between 1951 and 1961, the Irish-born population increased by 39% to 683,000. The Jamaican-born population increased from 6,000 to 100,000 between 1951 and 1961, a more than 16-fold increase. In 1961, the total Caribbean-born population in England and Wales was 172,000. The inflow of Jamaican-born migrants continued into the 1960s, with their number increasing another 71% between 1961 and 1971. The main reasons for emigration from the Caribbean nations to the UK were economic, both "push" and "pull". Further migrants arrived to join relatives from the Caribbean.