See also Tunisia: Key Economic and Social Indicators   BASIC DATA Official name: Republic of Tunisia Political system: Presidential Head of state: Zine El Abidine Ben Ali National day: March 20 Capital Tunis Main cities Sfax, Sousse, Bizerte, Nabeul, Gabes,Kairouan, ... Official language Arabic Spoken languages French, English, Italian, German Time zone: GMT + 1 Currency Tunisian Dinar GDP 3,380 dinars (2004) Population: 9.910 million (2004) Climate Mediterranean in the north and along the coast; semi-arid inland and to the south. Average temperature Dec:11.4°C/Jul: 29.3°C