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2009 Report
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This report breaks new ground in applying a human development approach to the study of migration.
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Why was the HDI methodology changed in the 1999 HDR?
The methodology of the HDI has evolved and improved over time. In 1999, the
formula used to treat the income component of the HDI was significantly
refined, setting the methodology on a more solid analytical foundation, for
details see 
Technical note 1 HDR 1999 [117 KB].
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