http://www.garfors.com/2013/01/the-25-l ... world.html
You can click that link for more details on each, but to save you a bit of time if you just want the list:
25. Dominica
24. Chad
23. Central African Republic
22. Liechtenstein
21. Djibouti
20. Sierra Leone
19. Tonga
18. East Timor
17. Bhutan
16. North Korea
15. Libya
14. Guinea-Bissau
13. Mauritanea
12. Federated States of Micronesia
11. Soloman Islands
10. Afghanistan
9. Comoros
8. Sao Tome and Principe
7. Turkmenistan
6. Equatorial Guinea
5. Marshall Islands
4. Kiribati
3. Tuvalu
2. Somalia
1. Nauru
I'm actually surprised that North Korea didn't even scratch the top ten!