Settled by Norwegian and Celtic (Scottish and Irish) immigrants during the late 9th and 10th centuries A.D., Iceland boasts the world's oldest functioning legislative assembly, the Althingi, which was established in 930. Independent for over 300 years, Iceland was subsequently ruled by Norway and Denmark. Fallout from the Askja volcano of 1875 devastated the Icelandic economy and caused widespread famine. Over the next quarter-century, 20% of the island's population emigrated, mostly to Canada and the US. Denmark granted limited home rule in 1874 and complete independence in 1944. The second half of the 20th century saw substantial economic growth driven primarily by the fishing industry. The economy diversified greatly after the country joined the European Economic Area in 1994, but the global financial crisis hit Iceland especially hard in the years after 2008. The economy is now on an upward trajectory, primarily thanks to a tourism and construction boom. Literacy, longevity, and social cohesion are first-rate by world standards.