Population Density (Persons per Square Kilometre)
Definition :

Population density is midyear population divided by land area in square kilometers. Population is based on the de facto definition of population, which counts all residents regardless of legal status or citizenship--except for refugees not permanently settled in the country of asylum, who are generally considered part of the population of their country of origin. Land area is a country's total area, excluding area under inland water bodies, national claims to continental shelf, and exclusive economic zones. In most cases the definition of inland water bodies includes major rivers and lakes.

Explanation :

The records of 2010 may not be consistent with previous years as they reflect provisional data taken from the 2010 Revision of the UN World Population Prospects.