A unitary parliamentary constitutional republic, Serbia is a member of the UN, CoE, OSCE, PfP, BSEC, CEFTA, and is acceding to the WTO. Since 2014, the country has been negotiating its EU accession, with the aim of joining the European Union by 2025. Serbia has been formally adhering to the policy of military neutrality. The country provides universal health care and free primary and secondary education to its citizens. An upper-middle-income economy with a dominant service sector, the country has been ranked 64th on the Human Development Index.