In 2011, the Tunisian Revolution, triggered by the lack of freedom and democracy under the 24-year rule of president Zine El Abidine Ben Ali, overthrew his regime and catalyzed the broader Arab Spring across the region. Free multiparty parliamentary elections were held shortly after; the country again voted for parliament on 26 October 2014, and for president on 23 November 2014. Tunisia remains a unitary semi-presidential representative democratic republic; and is the only North African country classified as "Free" by Freedom House, and considered the only fully democratic state in the Arab World in the Economist Intelligence Unit's Democracy Index. It is one of the few countries in Africa ranking high in the  Human Development Index, with one of the highest per capita incomes in the continent.