For a small government, Iceland. But it is hard to compare small governments with large ones. In small societies the path length between individuals is also small, so it is easier to know what is going on in government. Transparency is enforced by proximity and cultural norms as well as bureaucratic standards. See https://immi.is/

The Associated Press has quantified this in some great 2011 research; basically, the “old” democracies are in a state of decay and the “new” democracies eclipse them in their striving to be something:

— Newer democracies were in general more responsive than some developed ones. Guatemala confirmed the AP request in 72 hours, and sent all documents in 10 days. Turkey sent spreadsheets and data within seven days. Mexico posted responses on the Web. By comparison, Canada asked for a 200-day extension. The FBI in the United States responded six months late with a single sheet with four dates, two words and a large section blanked. Austria never responded at all. — More than half the countries did not release anything, and three out of 10 did not even acknowledge the request. African governments led the world for ignoring requests, with no response whatsoever from 11 out of 15 countries. — Dozens of countries adopted their laws at least in part because of financial incentives, and so are more likely to ignore them or limit their impact. China changed its access-to-information rules as a condition to joining the World Trade Organization in 2001, to boost the economy by as much as 10 percent. Beijing has since expanded the rules beyond trade matters. Pakistan adopted its 2002 ordinance in return for $1.4 billion in aid from the International Monetary Fund. Neither country responded to the AP’s test. “Having a law that’s not being obeyed is almost worse than not having a law at all,” says Daniel Metcalf, the leading U.S. Freedom of Information authority at the Justice Department for the past 25 years, now a law professor at American University. “The entire credibility of a government is at stake.”

http://www.apnewsarchive.com/87c10183e1794b738b5876e13033763

http://www.reddit.com/r/IAmA/comments/28js8v/i_am_julian_assange_publisher_of_wikileaks_ask_me/