According to the UNDP, in 2010 the life expectancy at birth for Costa Ricans was 79.3 years. The Nicoya Peninsula is considered one of the Blue Zones in the world, where people commonly live active lives past the age of 100 years. The New Economics Foundation (NEF) ranked Costa Rica first in its 2009 Happy Planet Index, and once again in 2012. The index measures the health and happiness they produce per unit of environmental input. According to NEF, Costa Rica's lead is due to its very high life expectancy which is second highest in the Americas, and higher than the United States. The country also experienced well-being higher than many richer nations and a per capita ecological footprint one-third the size of the United States.