How many European countries who are member of European union but they are not using euro as their currency?

How many European countries who are member of European union but they are not using euro as their currency?

کتنے یورپی ممالک ہیں جو یورپی یونین کے رکن ہیں لیکن وہ یورو کو اپنی کرنسی کے طور پر استعمال نہیں کر رہے؟
Explanation

There are seven European Union countries that do not use the euro as their currency: 

  1. Bulgaria
  2. The Czech Republic
  3. Denmark
  4. Hungary
  5. Poland
  6. Romania
  7. Sweden