Nation Master 
This is a site where you can compare between countries and you don’t have to rely on just once source, but all sources are cited so you can check up to make sure they are legitimate.
How can you use this site? Well check out their introduction and they’ll let you know just how you can:
“Welcome to NationMaster.com, a massive central data source and a handy way to graphically compare nations. NationMaster is a vast compilation of data from such sources as the CIA World Factbook, United Nations, World Health Organization, World Bank, World Resources Institute, UNESCO, UNICEF and OECD… You can generate maps and graphs on all kinds of statistics with ease.”
With some great example maps and graphs on the front page you’ll know exactly what you are getting. You can also check out the most generated graphs from the list on the side bar. From which country is the most murderous, richest, longest living, most educated, most athletic, or even most taxed.
You should also check out the “Interesting Facts” at the top of the page that change randomly, or you could check them all out by clicking the Interesting Facts link beneath the facts. Facts like:
Czech republic has more Internet Service Providers than any other non-English speaking country.
Andorra has no unemployment, which is just as well because they have no broadcast TV channels either.
Andorrans live the longest, four years longer than in neighbouring France and Spain.
China’s labor force stands at 706 million people, almost three times that of Europe and twice that of North and South America combined
This is a really cool site with tons of great information, so check it out!