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Statistics were gathered using the Human Development Report of 2018. The United Nations Development Programme uses the following cut-off points to sort countries into quartiles.

Human development classification
HDI classifications are based on HDI fixed cut-off points, which are derived from the quartiles of distributions of the component indicators. The cut-off points are: HDI of less than 0.550 for low human development, 0.550–0.699 for medium human development, 0.700–0.799 for high human development and 0.800 or greater for very high human development.

LOW= BELOW .550 (36 Countries)

MEDIUM=.55-.699 (36 Countries)

HIGH=.7-.799 (54 Countries)

VERY HIGH=.8+ (61 Countries)