Variable	Measurement	Era	Code	N	Source
Centrality	Central vs peripheral	1970	WorldPosition_70	23	VanDam 1988: 20-21
Export	Export of goods and services in % GDP	1990	Export_1990	168	UN-HDR 2007 table 16
		2000	Export_2000	161	UN-HDR 2002 table 14
		2005	Export_2005	160	UN-HDR 2007 table 16
Import	Imports of goods and services in % GDP	1990	Import_1990	165	UN-HDR 2007 table 16
		2000	Import_2000	156	UN-HDR 2002 table 14
		2005	Import_2005	161	UN-HDR 2007 table 16

Related topics: Globalization, Migration, Standard of living
Related themes: Economy, Modernity

The dataset States of Nations is about characteristics of countries in periods (macro variables). It is part of the World Database of Happiness. Developed for the identification of societal conditions for happiness, the source can also be used for other purposes.