The HDI measures the life expectancy, education, standard of living and literacy rate of a country. In the world Norway has the highest HDI of 0.943 as of 2011 and ranks 1. Rank 2 goes to Australia which has the HDI of 0.929. USA with HDI of 0.91 ties with Netherlands for the 3rd place.
There has been a considerable increase in HDI in many countries from 2010 data. Top 10 countries withheld their respective positions in the rankings. But changes in the ranking were seen in Hong Kong which moved up one position and became the 13th country to have very high HD and Iceland went down from its 13th position to 14th position.
Overall, the estimates of 2011 data show that 51% of the world's total population fall under medium human development. Countries that had both high and very high human development constitute for a 30% of the world's total population. And 18% for low human development.