| Accession | Country | % Correct |
|---|---|---|
| 1st January 1958(Founders) | Belgium | 97%
|
| France | 91%
| |
| Germany | 91%
| |
| Italy | 91%
| |
| Luxembourg | 89%
| |
| Netherlands | 89%
| |
| 1st January 1986 | Portugal | 89%
|
| Spain | 89%
| |
| United Kingdom | 88%
| |
| 1st January 1995 | Austria | 86%
|
| 1st January 1973 | Denmark | 85%
|
| Ireland | 83%
| |
| 1st July 2013 | Croatia | 80%
|
| 1st January 1981 | Greece | 80%
|
| Finland | 79%
| |
| Poland | 79%
| |
| Romania | 79%
| |
| Sweden | 79%
| |
| 1st January 2007 | Bulgaria | 77%
|
| Latvia | 77%
| |
| Lithuania | 77%
| |
| Czech Republic | 76%
| |
| Estonia | 76%
| |
| Hungary | 76%
| |
| Slovenia | 76%
| |
| Slovakia | 74%
| |
| 1st May 2004 | Cyprus | 73%
|
| Malta | 68%
|