The 10 founding members were Belgium, Denmark, France, Germany, Italy, the Netherlands, Spain, Sweden, Switzerland and the United Kingdom. Ireland joined on 31 December 1975. In 1987, Austria and Norway became member states. Finland joined in 1995, Portugal in 2000, Greece and Luxembourg in 2005, the Czech Republic in 2008, and Romania in 2011. Currently, it has 20 member states: all the EU member states before 2004, plus Czech Republic, Norway, Poland, Romania, and Switzerland. In addition, Canada has had the special status of a Cooperating State under a series of cooperation agreements dating since 1979. In 2007 the political perspective of the European Union was to make ESA an agency of the EU by 2014. ESA is likely to expand in the coming years with the countries which joined the EU in both 2004 and 2007. Currently, almost all EU member states are in different stages of affiliation with ESA. Poland has joined on 19 November 2012. Hungary and Estonia have signed ESA Convention. Latvia and Slovenia have started to implement a Plan for European Cooperating State (PECS) Charter. Slovakia, Lithuania and Bulgaria have signed a European Cooperating State (ECS) Agreement. Cyprus, Malta and Croatia have signed Cooperation Agreements with ESA. A small group of EU member states have joined all European treaties, instead of opting out on some. They drive the development of a federal model for the European integration. This is linked to the concept of Multi-speed Europe where some countries would create a core union; and goes back to the Inner Six references to the founding member states of the European Communities. At present the formation of a formal Core Europe Federation ("a federation within the confederation") had been held off at every occasion that such a federation treaty had been discussed. Instead supranational institutions are created that govern more areas in "Inner Europe" than the existing European integration provides for. Among the 27 EU state members, seventeen states have signed all integration agreements: Austria, Belgium, Finland, Estonia, France, Germany, Greece, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Portugal, Slovakia, Slovenia and Spain. The agreements considered include the fifth stage of economic integration or EMU, the Schengen agreement and the Common Security and Defence Policy. Thus, among the 27 EU countries, 19 have joined the Eurozone, 22 have joined Schengen, and 26 compose the European Military. Further, some countries which do not belong to the EU have joined several of these initiatives, albeit sometimes at a lower stage such as the Customs Union, the Common Market (EEA), or even unilaterally adopting the euro; by taking part in Schengen, either as a signatory state, or "de facto"; or by joining some common military forces.