| Countries | Year of accession | % Correct |
|---|---|---|
| Cyprus, Czechia, Estonia, Hungary, Latvia,Lithuania Malta, Poland, Slovakia, Slovenia | 2004 | 98%
|
| Austria, Finland, Sweden | 1995 | 97%
|
| Denmark, Ireland, United Kingdom (withdrawn 2020) | 1973 | 94%
|
| Bulgaria, Romania | 2007 | 94%
|
| Greece | 1981 | 93%
|
| Portugal, Spain | 1986 | 93%
|
| Croatia | 2013 | 93%
|
| Belgium, France, Germany (West Germanyuntil 1990), Italy, Luxembourg, Netherlands | 1952 | 92%
|