Every year, the Legatum Institute, a London-based think tank, releases its annual global Prosperity Index, a huge survey that ranks the most prosperous countries in the world.

The amount of money a country has is one factor of prosperity, but the Legatum Institute considers more than that in its ranking.

The organisation compares 89 variables to come up with its list. These variables include traditional indicators like per capita gross domestic product and the number of people in full-time work as well as more interesting figures such as the number of secure internet servers a country has and how well rested people feel on a day-to-day basis.

The variables are then split into eight subindexes: economy, entrepreneurship and opportunity, governance, education, health, safety and security, personal freedom, and social capital.

The index looked at the 142 countries that have the most available data. Here are the top-performing nations.

31. Estonia  The northern European nation is known for being one of the world's most tech savvy places, and it scored well in the entrepreneurship and opportunity subindex as a result, coming in 26th.

30. United Arab Emirates  The only Middle Eastern nation in the top 31 countries, the UAE was helped by finishing 21st in the economy subindex. That's not too big a surprise given the vast wealth on show in cities like Dubai and Abu Dhabi.

29. Poland  Poland scored solidly across the board but did best in the safety and security, and personal freedom categories. People living in Poland are the 26th safest and 29th freest people on earth.

28. South Korea  One of Asia's three true economic powerhouses, along with China and Japan, South Korea's position in the Prosperity Index is cemented thanks to finishing 17th in the economy subindex.

27. Portugal  Portugal may have had its economic troubles in recent years, but it is still very prosperous in the grand scheme of things. The southern European state ranked in the top 20 for both personal freedom, and safety and security.

26. Czech Republic  The nation in Central Europe has jumped three places this year. In the economy subindex it was rated very highly  13th  but it performed badly in the index's social-capital ranking.

25. Slovenia  As with the Czech Republic, education in Slovenia scored very highly. Finishing 58th out of 142 in the economy index, however, meant Slovenia fell one place this year.

24. Spain  The most popular holiday destination for Brits scored well across the board, but top scores for education and personal freedom pushed Spain into the top 25.

23. Malta  Even though Malta's education system ranked 42nd, strong scores in all other subindexes mean Malta kept the same position as last year in the Prosperity Index.

22. France  France has fallen one place in this year's ranking. Its health score was eighth overall, but a low social-capital score pushed it outside the top 20 for the third time in four years.

21. Taiwan  The island nation is just outside the top 20 after being given a big boost by a strong performance in safety and security, where it ranked sixth.

20. Hong Kong  People in Hong Kong can enjoy being top of the pile when it comes to safety and security and in the top 10 for entrepreneurship and opportunity.

19. Japan  Citizens in Japan are the seventh-healthiest on earth, according to the Prosperity Index, but the country is 33rd in terms of personal freedom, lowering its overall ranking.

18. Belgium  Ranked inside the top 25 in every subindex, Belgium scored best on health (10th). Despite that, it fell by one place in the Prosperity Index this year.

17. Singapore  Singapore swapped places with Belgium in this year's Index and was helped by finishing first in the economy subindex.

16. Austria  Finishing inside the top 10 in two categories  health, and entrepreneurship and opportunity  wasn't enough to stop Austria from sliding one place this year.

15. United Kingdom  Britain fell two places this year, in part by finishing outside the top 20 in the education and safety indexes.

14. Germany  According to the Prosperity Index, Germany has the fifth-best economy in the world, helping it stay 14th for the fourth year running.

13. Luxembourg  Citizens enjoy high levels of personal freedom and health, as well as strong governance and a good economy, helping it rise from 16th in 2014.

12. Iceland  The north Atlantic nation finished in the top five in three subindexes: personal freedom, safety and security, and entrepreneurship and opportunity. This wasn't enough to stop it from falling one place from the 2014 index.

11. United States  The world's most powerful country scored higher than any other in the Legatum Institute's health category, but its citizens are among the least safe and secure on this list. The US was 33rd in this subindex.

10. Ireland  Ireland jumped two places in this year's index, thanks to finishing fourth in safety and security.

9. Finland  The Finnish enjoy the fifth-best performance of governance in the world, but their relatively poor economy, ranked 33rd, has helped push the country down from eighth last year.

8. Netherlands  Gaining one place in this year's index, the Netherlands is ranked highly in education, health, and personal freedom.

7. Australia  The country has ranked seventh for three consecutive years, and this year the Prosperity Index rated it as having the world's best education system.

6. Canada  According to the Prosperity Index, Canada is the true land of the free, as its citizens enjoy the highest levels of personal freedom of any nation surveyed. It fell one place from last year.

5. Sweden  Swedes are blessed with the world's highest levels of entrepreneurship and opportunity, helping the country gain one place in this year's index.

4. New Zealand  Strong social cohesion and community engagement mean New Zealand has the best level of social capital. It was rated the most prosperous non-European nation.

3. Denmark  Danes can enjoy great governance, top-level education, and a high social-capital score. If not for its relatively poor health score (16th), the country might top the whole Index. It climbed one place this year.

2. Switzerland  Switzerland has been second in the Prosperity Index for three consecutive years. The Alpine nation ranks top of the governance subindex and has the second-highest-rated economy.

.

1. Norway  The Scandinavian country tops the Prosperity Index once again in 2015. It has been first in each of the past seven years. Norway is the only country ranked in the top 10 of every subindex.

Culled from Business Insider