Serbia is an upper-middle income economy, ranked 64th and "very high" in the Human Development Index domain. It is a unitary parliamentary constitutional republic, 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.