<Ul> <Li> Article 50 </Li> </Ul> <Li> Treaties of Accession <Ul> <Li> 1972, 1979, 1985, 1994, 2003, 2005, 2011 </Li> </Ul> </Li> <Ul> <Li> 1972, 1979, 1985, 1994, 2003, 2005, 2011 </Li> </Ul> <Li> 1972, 1979, 1985, 1994, 2003, 2005, 2011 </Li>

Which countries are net contributors to the eu