Network World has recently published a map of countries that either encourage or mandate for consideration the use of Open Source software within their governmental institutions:
The article by Jon Gold is entitled “Which countries have open-source laws on the books?” and also points out that it is not that easy to provide a distinct and reliable picture.
So there is still a way to go and if you like to see more yellow countries, support the Free Software Foundation / Free Software Foundation Europe or the Open Source Initiative.