Human Development Index

Country	1990	2000	2010	2015	2017	2018	2019	2020	2021
Cameroon	0.452	0.442	0.513	0.56	0.557	0.56	0.563	0.578	0.576
Sudan	0.336	0.424	0.486	0.508	0.509	0.514	0.514	0.51	0.508
Algeria	0.591	0.649	0.721	0.74	0.745	0.745	0.748	0.736	0.745
Chad		0.291	0.362	0.389	0.396	0.398	0.403	0.397	0.394
Nigeria			0.482	0.516	0.531	0.534	0.538	0.535	0.535
Central African Republic	0.338	0.329	0.372	0.384	0.391	0.405	0.411	0.407	0.404
Libya	0.666	0.712	0.739	0.699	0.714	0.722	0.722	0.703	0.718
Niger	0.216	0.262	0.338	0.376	0.386	0.399	0.406	0.401	0.4

HDI

The Human Development Index (HDI) is a summary measure of average achievement in key dimensions of human development: a long and healthy life, being knowledgeable and have a decent standard of living. The HDI is the geometric mean of normalized indices for each of the three dimensions.

The health dimension is assessed by life expectancy at birth, the education dimension is measured by mean of years of schooling for adults aged 25 years and more and expected years of schooling for children of school entering age. The standard of living dimension is measured by gross national income per capita. The HDI uses the logarithm of income, to reflect the diminishing importance of income with increasing GNI.

The scores for the three HDI dimension indices are then aggregated into a composite index using geometric mean.