The following 24 countries have been added to current 43 e-visa permitted countries since 02 Oct 2014 by Myanmar Immigration : 

1. Argentina

2. Austria

3. Bulgaria

4. Chile

5. Colombia

6. Croatia

7. Cyprus

8. Estonia

9. Greece

10. Hungary

11. Ireland

12. Latvia

13. Lithuania

14. Luxembourg

15. Malta

16. Mongolia

17. Panama

18. Peru

19. Portugal

20. Romania

21. Slovakia

22. Slovenia

23. Sweden

24. Venezuela 

Below is the official e visa website by Myannmar Immigration.

http://evisa.moip.gov.mm/

Reference: Announcement by Ministry of Hotel & Tourism Myanmar