Poland is the fifth most populous member state of the European Union and has a grand total of 52 representatives in the European Parliament as of 2020. Since joining the union in 2004, successive Polish governments have pursued policies to extend the country's role in European and international affairs. Poland is an emerging regional power in Central Europe. The capital of Warsaw serves as the headquarters for Frontex, the European Union's agency for external border security as well as ODIHR, one of the principal institutions of the Organization for Security and Cooperation in Europe.