1979 - EU9: 9 Member/States: Germany, France, Italy, Netherlands, Belgium, Luxembourg, United Kingdom, Denmark and Ireland.
1984 - EU10: The 9 Member/States + Greece, which joined in 1981.
1989 - EU12: The 10 Member/States + Spain and Portugal, which joined in 1986.
1994 - EU12: The 12 Member/States.
1999 - EU15: The 12 Member/States + Austria, Sweden and Finland, which joined in 1995.
2004 - EU25: The 15 Member/States + Poland, Hungary, Slovenia, Slovakia, Czech Republic, Estonia, Latvia, Lithuania, Cyprus and Malta, which joined in 2004.
2009 - EU27: The 25 Member/States + Bulgaria and Romania, which joined in 2007.
2014 - EU28: The 27 Member/States + Croatia, which joined in 2013.