I want to know the answer to the following question:
How long has the Czech Republic been a member of the European Union?
All the background I'm provided with is that "Czech, the official language of the Czech Republic (a member of the European Union since 2004), is one of the EU's official languages and the 2012 Eurobarometer survey found that Czech was the foreign language most often used in Slovakia.". Is that enough to answer the question?