I also thought to make a personal top of the countries that have had entries in the last 15 years. I decided to choose my first 5 countries most eligible to win every year and to count the times each country would be in my list. This is what has resulted. Read from pink through blue to yellow.
So, my favourite country in ESC (since I watch it regularly) would be SWEDEN. ISRAEL is the runner-up. Third place is shared by RUSSIA and ROMANIA. The rest are:
4th. NORWAY, FRANCE, CROATIA, SERBIA (+- MONTENEGRO)
5th. SLOVENIA, MACEDONIA, GREECE, TURKEY, ESTONIA
6th. BELGIUM, GERMANY, HUNGARY, ALBANIA, UKRAINE, BOSNIA
7th. ICELAND, PORTUGAL, DENMARK, NETHERLANDS, LATVIA, BELARUS, ITALY, CYPRUS, BULGARIA
If questions, I used Paint.NET (free) for creating each pic and PhotoScape (free) for the final stuff.