The Legatum Institute, a London-based research institute released its 10th annual global Prosperity Index in November, a huge survey that ranks the most prosperous countries in the world.The organisation compares 104 variables to come up with its list, splitting those variables into nine subindexes. One of the big components of the ranking is how healthy a country’s people are.Health is measured by three key components by the Legatum Institute: a country’s basic mental and physical health, health infrastructure, and the availability of preventative care.