On December 21, 1992, Czechoslovakia, Hungary and Poland signed the Central European Free Trade Agreement (CEFTA), which aims to stimulate regional trade by abolishing tariff and non-tariff barriers among the member countries. A free trade zone will be established by the year 2001. The Visegrad four have since been joined in trade cooperation by Slovenia (1996), Romania (1997) and Bulgaria (1997) and today the CEFTA countries cover a common market of nearly 90 million people and represent a bloc to be taken seriously during trade negotiations. Another regional grouping in which the Czech Republic participates is the Central European Initiative. The initial idea for this form of cooperation came from the 1989 meeting in Budapest of the deputy prime ministers of Austria, Hungary, Italy and Yugoslavia. Today the sixteen-member Central European Initiative continues to function without an institutional structure, and has some modest accomplishments to its name. One organization that works for human rights and democracy all over the European continent is the Council of Europe, in Strasbourg. Hopes for reconciliation and for a "United States of Europe", in the words of Sir Winston Churchill, meant that movements for European unity were springing up everywhere after 1945. In 1949, the Council of Europe was born, hurried on by the sharp East-West tensions marked by the Communist takeover in Czechoslovakia in 1948 and the Berlin airlift of 1948-9. After the fall of the Berlin Wall, the Council of Europe opened its doors to the new democracies of Eastern Europe and Czechoslovakia became a member of the organisation in 1991. Attempts at healing the ideological division in Europe and fostering security and cooperation in the 1970s sparked the Helsinki process. Czechoslovakia, along with every other European nation (except Albania and Andorra) began to participate in these negotiations in 1973. Today, the Czech Republic is one of the 55 members of the descendant of the Helsinki process, the Organisation for Security and Cooperation in Europe (OSCE). The OSCE International Secretariat has its headquarters in Vienna and an office in Prague.